pgsql: Fix searchpath and module location for pg_rewind and ssl TAP tes

Fix searchpath and module location for pg_rewind and ssl TAP tests

The modules RewindTest.pm and ServerSetup.pm are really only useful for
TAP tests, so they really belong in the TAP test directories. In
addition, ServerSetup.pm is renamed to SSLServer.pm.

The test scripts have their own directories added to the search path so
that the relocated modules will be found, regardless of where the tests
are run from, even on modern perl where "." is no longer in the
searchpath.

Discussion: https://postgr.es/m/e4b0f366-269c-73c3-9c90-d9cb0f4db1f9@2ndQuadrant.com

Backpatch as appropriate to 9.5

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/8ce641f99709669133c6cbb12aa3d516af7897aa

Modified Files
--------------
src/bin/pg_rewind/t/001_basic.pl | 3 +++
src/bin/pg_rewind/t/002_databases.pl | 3 +++
src/bin/pg_rewind/t/003_extrafiles.pl | 3 +++
src/bin/pg_rewind/t/004_pg_xlog_symlink.pl | 3 +++
src/bin/pg_rewind/t/005_same_timeline.pl | 3 +++
src/bin/pg_rewind/{ => t}/RewindTest.pm | 0
src/test/ssl/t/001_ssltests.pl | 7 ++++++-
src/test/ssl/t/002_scram.pl | 7 ++++++-
src/test/ssl/{ServerSetup.pm => t/SSLServer.pm} | 2 +-
9 files changed, 28 insertions(+), 3 deletions(-)