Prior to this change tests that required NTLM feature did not require
SSL feature.

There are pending changes to cmake builds that will allow enabling NTLM
in non-SSL builds in Windows. In that case the NTLM auth strings created
are different from what is expected by the NTLM tests and they fail:

"The issue with NTLM is that previous non-SSL builds would not enable
NTLM and so the NTLM tests would be skipped."

Assisted-by: marc-groundctl@users.noreply.github.com

Ref: https://github.com/curl/curl/pull/4717#issuecomment-566218729

Closes https://github.com/curl/curl/pull/4768

NTLM2 did not work i.e. no NTLMv2 response was created. Changing the
check seems to work.

Ref: https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-NLMP/[MS-NLMP].pdf

Fixes https://github.com/curl/curl/issues/3286
Closes https://github.com/curl/curl/pull/3287
Closes https://github.com/curl/curl/pull/3415

Curl_rand() will return a dummy and repatable random value for this
case. Makes it possible to write test cases that verify output.

Also, fake timestamp with CURL_FORCETIME set.

Only when built debug enabled of course.

Curl_ssl_random() was not used anymore so it has been
removed. Curl_rand() is enough.

create_digest_md5_message: generate base64 instead of hex string

curl_sasl: also fix memory leaks in some OOM situations

Added required "debug" feature, missed in commit 1c9aaa0bac, as NTLMv2
calls Curl_rand() which can only be fixed to a specific entropy in
debug builds.

As the email protocols implement SASL authentication rather than IMAP,
POP3 and SMTP specific authentication, updated the authentication
keywords to reflect this.