pgsql: Fix missing "use Test::More" in Kerberos.pm.

Fix missing "use Test::More" in Kerberos.pm.

Apparently the only Test::More function this script uses is
BAIL_OUT, so this omission just results in the wrong error
output appearing in the cases where it bails out.

Seems to have been an oversight in commit 9f899562d which
split Kerberos.pm out of another script.

Author: Maxim Orlov <orlovmg@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: /messages/by-id/CACG=ezY1Dp-S94b78nN0ZuaBGGcMUB6_nF-VyYUwPt1ArFqmGA@mail.gmail.com
Backpatch-through: 17

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5e8f05cd70a6a5446801b4c733874bd6603eba7b

Modified Files
--------------
src/test/perl/PostgreSQL/Test/Kerberos.pm | 1 +
1 file changed, 1 insertion(+)