Adds Firewall rules for glance access.

Allows connection to the glance service only
for nova compute hosts.

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

Fixes (partially): rhbz#1002063

Change-Id: If1ecc3b9e251a6f6bc7ba246ba9600b81d1190de
Merge "Adds Firewall rules for glance access."