Refine SSL tests test name reporting

Refine SSL tests test name reporting

Instead of using the psql/libpq connection string as the displayed test
name and relying on "notes" and source code comments to explain the
tests, give the tests self-explanatory names, like we do elsewhere.

Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>