Document PG_TEST_EXTRA=libpq_encryption and also check 'kerberos'

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 4cc1c76fe9f13aa96bae14f4fcfdf6d508af72a4
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-04-12T16:52:39Z
Releases: 17.0
Document PG_TEST_EXTRA=libpq_encryption and also check 'kerberos'

In the libpq encryption negotiation tests, don't run the GSSAPI tests
unless PG_TEST_EXTRA='kerberos' is also set. That makes it possible to
still run most of the tests when GSSAPI support is compiled in, but
there's no MIT Kerberos installation.

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