packaging: setup: keeping PostgreSQL port open if the DBMS is local

on system with iptables engine-setup is going to completely
rewrite iptables rules. Kepping DB port open if the DBMS is local
also if we are not upgrading.

Change-Id: I92350ec322162e8c199174cf6fa7a1d517af8998
Bug-Url: https://bugzilla.redhat.com/1141286
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>