Revert all SASL authzid (new feature) commits

- Revert all commits related to the SASL authzid feature since the next
  release will be a patch release, 7.65.1.

Prior to this change CURLOPT_SASL_AUTHZID  / --sasl-authzid was destined
for the next release, assuming it would be a feature release 7.66.0.
However instead the next release will be a patch release, 7.65.1 and
will not contain any new features.

After the patch release after the reverted commits can be restored by
using cherry-pick:

git cherry-pick a14d72c a9499ff 8c1cc36 c2a8d52 0edf690

Details for all reverted commits:

Revert "os400: take care of CURLOPT_SASL_AUTHZID in curl_easy_setopt_ccsid()."

This reverts commit 0edf6907ae37e2020722e6f61229d8ec64095b0a.

Revert "tests: Fix the line endings for the SASL alt-auth tests"

This reverts commit c2a8d52a1356a722ff9f4aeb983cd4eaf80ef221.

Revert "examples: Added SASL PLAIN authorisation identity (authzid) examples"

This reverts commit 8c1cc369d0c7163c6dcc91fd38edfea1f509ae75.

Revert "curl: --sasl-authzid added to support CURLOPT_SASL_AUTHZID from the tool"

This reverts commit a9499ff136d89987af885e2d7dff0a066a3e5817.

Revert "sasl: Implement SASL authorisation identity via CURLOPT_SASL_AUTHZID"

This reverts commit a14d72ca2fec5d4eb5a043936e4f7ce08015c177.

4 files changed, 2 insertions, 304 deletions

diff --git a/docs/examples/Makefile.inc b/docs/examples/Makefile.inc
index d0cce337c..8dd55b9df 100644
--- a/docs/examples/Makefile.inc
+++ b/docs/examples/Makefile.inc
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -35,7 +35,7 @@ check_PROGRAMS = 10-at-a-time anyauthput cookie_interface debug fileupload \
   http2-upload http2-serverpush getredirect ftpuploadfrommem               \
   ftpuploadresume sslbackend postit2-formadd multi-formadd                 \
   shared-connection-cache sftpuploadresume http2-pushinmemory parseurl     \
-  urlapi imap-authzid pop3-authzid smtp-authzid
+  urlapi
 
 # These examples require external dependencies that may not be commonly
 # available on POSIX systems, so don't bother attempting to compile them here.
diff --git a/docs/examples/imap-authzid.c b/docs/examples/imap-authzid.c
deleted file mode 100644
index bfe7d71d7..000000000
--- a/docs/examples/imap-authzid.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-/* <DESC>
- * IMAP example showing how to retreieve e-mails from a shared mailed box
- * </DESC>
- */
-
-#include <stdio.h>
-#include <curl/curl.h>
-
-/* This is a simple example showing how to fetch mail using libcurl's IMAP
- * capabilities.
- *
- * Note that this example requires libcurl 7.66.0 or above.
- */
-
-int main(void)
-{
-  CURL *curl;
-  CURLcode res = CURLE_OK;
-
-  curl = curl_easy_init();
-  if(curl) {
-    /* Set the username and password */
-    curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
-    curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
-
-    /* Set the authorisation identity (identity to act as) */
-    curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "shared-mailbox");
-
-    /* Force PLAIN authentication */
-    curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=PLAIN");
-
-    /* This will fetch message 1 from the user's inbox */
-    curl_easy_setopt(curl, CURLOPT_URL,
-                     "imap://imap.example.com/INBOX/;UID=1");
-
-    /* Perform the fetch */
-    res = curl_easy_perform(curl);
-
-    /* Check for errors */
-    if(res != CURLE_OK)
-      fprintf(stderr, "curl_easy_perform() failed: %s\n",
-              curl_easy_strerror(res));
-
-    /* Always cleanup */
-    curl_easy_cleanup(curl);
-  }
-
-  return (int)res;
-}
diff --git a/docs/examples/pop3-authzid.c b/docs/examples/pop3-authzid.c
deleted file mode 100644
index 57363579a..000000000
--- a/docs/examples/pop3-authzid.c
+++ /dev/null
@@ -1,70 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-/* <DESC>
- * POP3 example showing how to retrieve e-mails from a shared mailbox
- * </DESC>
- */
-
-#include <stdio.h>
-#include <curl/curl.h>
-
-/* This is a simple example showing how to retrieve mail using libcurl's POP3
- * capabilities.
- *
- * Note that this example requires libcurl 7.66.0 or above.
- */
-
-int main(void)
-{
-  CURL *curl;
-  CURLcode res = CURLE_OK;
-
-  curl = curl_easy_init();
-  if(curl) {
-    /* Set the username and password */
-    curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
-    curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
-
-    /* Set the authorisation identity (identity to act as) */
-    curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "shared-mailbox");
-
-    /* Force PLAIN authentication */
-    curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=PLAIN");
-
-    /* This will retrieve message 1 from the user's mailbox */
-    curl_easy_setopt(curl, CURLOPT_URL, "pop3://pop.example.com/1");
-
-    /* Perform the retr */
-    res = curl_easy_perform(curl);
-
-    /* Check for errors */
-    if(res != CURLE_OK)
-      fprintf(stderr, "curl_easy_perform() failed: %s\n",
-              curl_easy_strerror(res));
-
-    /* Always cleanup */
-    curl_easy_cleanup(curl);
-  }
-
-  return (int)res;
-}
diff --git a/docs/examples/smtp-authzid.c b/docs/examples/smtp-authzid.c
deleted file mode 100644
index decdb719d..000000000
--- a/docs/examples/smtp-authzid.c
+++ /dev/null
@@ -1,161 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-/* <DESC>
- * Send e-mail on behalf of another user with SMTP
- * </DESC>
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <curl/curl.h>
-
-/*
- * This is a simple example show how to send an email using libcurl's SMTP
- * capabilities.
- *
- * Note that this example requires libcurl 7.66.0 or above.
- */
-
-/* The libcurl options want plain addresses, the viewable headers in the mail
- * can very well get a full name as well.
- */
-#define FROM_ADDR    "<ursel@example.org>"
-#define SENDER_ADDR  "<kurt@example.org>"
-#define TO_ADDR      "<addressee@example.net>"
-
-#define FROM_MAIL    "Ursel " FROM_ADDR
-#define SENDER_MAIL  "Kurt " SENDER_ADDR
-#define TO_MAIL      "A Receiver " TO_ADDR
-
-static const char *payload_text[] = {
-  "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
-  "To: " TO_MAIL "\r\n",
-  "From: " FROM_MAIL "\r\n",
-  "Sender: " SENDER_MAIL "\r\n",
-  "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
-  "rfcpedant.example.org>\r\n",
-  "Subject: SMTP example message\r\n",
-  "\r\n", /* empty line to divide headers from body, see RFC5322 */
-  "The body of the message starts here.\r\n",
-  "\r\n",
-  "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
-  "Check RFC5322.\r\n",
-  NULL
-};
-
-struct upload_status {
-  int lines_read;
-};
-
-static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
-{
-  struct upload_status *upload_ctx = (struct upload_status *)userp;
-  const char *data;
-
-  if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
-    return 0;
-  }
-
-  data = payload_text[upload_ctx->lines_read];
-
-  if(data) {
-    size_t len = strlen(data);
-    memcpy(ptr, data, len);
-    upload_ctx->lines_read++;
-
-    return len;
-  }
-
-  return 0;
-}
-
-int main(void)
-{
-  CURL *curl;
-  CURLcode res = CURLE_OK;
-  struct curl_slist *recipients = NULL;
-  struct upload_status upload_ctx;
-
-  upload_ctx.lines_read = 0;
-
-  curl = curl_easy_init();
-  if(curl) {
-    /* This is the URL for your mailserver. In this example we connect to the
-       smtp-submission port as we require an authenticated connection. */
-    curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com:587");
-
-    /* Set the username and password */
-    curl_easy_setopt(curl, CURLOPT_USERNAME, "kurt");
-    curl_easy_setopt(curl, CURLOPT_PASSWORD, "xipj3plmq");
-
-    /* Set the authorisation identity (identity to act as) */
-    curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "ursel");
-
-    /* Force PLAIN authentication */
-    curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=PLAIN");
-
-    /* Note that this option isn't strictly required, omitting it will result
-     * in libcurl sending the MAIL FROM command with empty sender data. All
-     * autoresponses should have an empty reverse-path, and should be directed
-     * to the address in the reverse-path which triggered them. Otherwise,
-     * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
-     * details.
-     */
-    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM_ADDR);
-
-    /* Add a recipient, in this particular case it corresponds to the
-     * To: addressee in the header. */
-    recipients = curl_slist_append(recipients, TO_ADDR);
-    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
-
-    /* We're using a callback function to specify the payload (the headers and
-     * body of the message). You could just use the CURLOPT_READDATA option to
-     * specify a FILE pointer to read from. */
-    curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
-    curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
-    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
-
-    /* Send the message */
-    res = curl_easy_perform(curl);
-
-    /* Check for errors */
-    if(res != CURLE_OK)
-      fprintf(stderr, "curl_easy_perform() failed: %s\n",
-              curl_easy_strerror(res));
-
-    /* Free the list of recipients */
-    curl_slist_free_all(recipients);
-
-    /* curl won't send the QUIT command until you call cleanup, so you should
-     * be able to re-use this connection for additional messages (setting
-     * CURLOPT_MAIL_FROM and CURLOPT_MAIL_RCPT as required, and calling
-     * curl_easy_perform() again. It may not be a good idea to keep the
-     * connection open for a very long time though (more than a few minutes
-     * may result in the server timing out the connection), and you do want to
-     * clean up in the end.
-     */
-    curl_easy_cleanup(curl);
-  }
-
-  return (int)res;
-}