runtests: keep logfiles around by default

Make '-k' a no-op. The singletest function now clears the log directory
BEFORE each individual test and not after, which makes it possible to
always keep the logfiles around after a test has been run. No need to
specify -k anymore. Keeping the option parsing around to work with users
of old habits.

Some tests also didn't work properly when -k was used (since the old
logs would be kep when a new test starts) which this change also fixes.

Closes #4035

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