pgsql: Make tap tests store postmaster logs and handle vpaths correctly

Make tap tests store postmaster logs and handle vpaths correctly

Given this it is possible that the buildfarm animals running these tests
will be able to capture adequate logging to allow diagnosis of failures.

Branch
------
REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/450bf0ba530101822e6d5ecdd3d9c13fe01ebce5

Modified Files
--------------
src/Makefile.global.in | 2 +-
src/test/perl/TestLib.pm | 15 ++++++++++-----
2 files changed, 11 insertions(+), 6 deletions(-)

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