Disable unstable test cases in src/test/ssl/t/001_ssltests.pl.

Disable unstable test cases in src/test/ssl/t/001_ssltests.pl.

Some of the test cases added by commit 3a0e38504 are failing
intermittently in CI testing.  It looks like, when a connection
attempt fails, it's possible for psql to exit and the test script
to slurp up the postmaster's log file before the connected backend
has managed to write the log entry we're expecting to see.

It's not clear whether that's fixable in any robust way.  Pending
more thought, just comment out the log_like checks.  The ones in
connect_ok tests should be fine, since surely the log entry should
be emitted before we complete the client auth sequence.  I took
out all the ones in connect_fails tests though.

Discussion: https://postgr.es/m/E1oCNLk-000LCH-Af@gemulon.postgresql.org