packaging: setup: correctly writing pg_hba.conf

Fixing the parameter order writing pg_hba.conf

Change-Id: I6a75084ec5134570f0c27b60214db00813651370
Bug-Url: http://bugzilla.redhat.com/1134444
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>
(cherry picked from commit d431535542ab49f4db30e0b79125a07382a032a1)