pgsql: Fix handling of symlinked pg_stat_tmp and pg_replslot

Fix handling of symlinked pg_stat_tmp and pg_replslot

This was already fixed in HEAD as part of 6ad8ac60 but was not
backpatched.

Also change the way pg_xlog is handled to be the same as the other
directories.

Patch from me with pg_xlog addition from Michael Paquier, test updates
from David Steele.

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/5556420d46fd890fe684724daa32dd4bcc8c4b42

Modified Files
--------------
src/backend/replication/basebackup.c | 48 ++++++++++++++++++++++--------------
1 file changed, 30 insertions(+), 18 deletions(-)

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