packaging: setup: Update postgresql.conf listen_address

Allow connecting to the database from remote.

Listen on '*' (all local addresses) by default, env overridable.

Change-Id: I9e2111271732f395878621b23b9ca3689814a084
Bug-Url: https://bugzilla.redhat.com/1080997
Bug-Url: https://bugzilla.redhat.com/1080998
Signed-off-by: Yedidyah Bar David <didi@redhat.com>