pgsql: Fix searchpath and module location for pg_rewind and ssl TAPtes

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
------
REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/bbcafabb4462e8c8fc19bb191e16f3a78bb446aa

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/{ServerSetup.pm => t/SSLServer.pm} | 2 +-
8 files changed, 22 insertions(+), 2 deletions(-)