pgsql: Back-patch fixes to make TAP tests work on Windows.

Back-patch fixes to make TAP tests work on Windows.

This back-ports commit 13d856e177e69083 and assorted followon patches
into 9.4 and 9.5.  9.5 and HEAD are now substantially identical in all
the files touched by this commit, except that 010_pg_basebackup.pl has
a few more tests related to the new --slot option.  9.4 has many fewer
TAP tests, but the test infrastructure files are substantially the same,
with the exception that 9.4 lacks the single-tmp-install infrastructure
introduced in 9.5 (commit dcae5faccab64776).

The primary motivation for this patch is to ensure that TAP test case
fixes can be back-patched without hazards of the kind seen in commits
34557f544/06dd4b44f.  In principle it should also make the world safe
for running the TAP tests in the buildfarm in these branches; although
we might want to think about back-porting dcae5faccab64776 to 9.4 if
we're going to do that for real, because the TAP tests are quite disk
space hungry without it.

Michael Paquier did the back-porting work; original patches were by
him and assorted other people.

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/331828b754378733cb5c2e49227603e7354e4e39

Modified Files
--------------
doc/src/sgml/install-windows.sgml            |   24 ++++
src/Makefile.global.in                       |    4 +-
src/bin/pg_basebackup/t/010_pg_basebackup.pl |  165 +++++++++++++++-----------
src/bin/pg_ctl/t/001_start_stop.pl           |   14 ++-
src/bin/pg_ctl/t/002_status.pl               |    4 -
src/bin/pg_rewind/RewindTest.pm              |   35 +++---
src/bin/pg_rewind/t/004_pg_xlog_symlink.pl   |   15 ++-
src/test/perl/SimpleTee.pm                   |    1 +
src/test/perl/TestLib.pm                     |   97 +++++++++++++--
src/tools/msvc/clean.bat                     |    7 ++
src/tools/msvc/vcregress.pl                  |   47 +++++++-
11 files changed, 300 insertions(+), 113 deletions(-)