pgsql: Unset some local environment variables in TAP tests

Unset some local environment variables in TAP tests

Unset environment variables that control message language, so that we
can compare some program output with expected strings. This is very
similar to what pg_regress does.

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/87c4232fd35fc3d1ff06189e886bffb382f6ca87

Modified Files
--------------
src/test/perl/TestLib.pm | 6 ++++++
1 file changed, 6 insertions(+)

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