Adds Firewall rules for keystone access.

Allows connection to the keystone service only
for the hosts that need to (basically every
service).

This patch is for keystone only, rules for the other
services are being developed since the bug
addresses the entire openstack installation.

Fixes (partially): rhbz#1002063

Change-Id: I44cf008147bd1f0889e9cc78bda9d67889976c10
Merge "Adds Firewall rules for keystone access."