Fix radosgw 'rgw frontends' param

Fix 'rgw frontends' param on ceph-rgw container.
After apply this patch the service starts
http://paste.openstack.org/show/495786/

Closes-Bug: #1576817
Change-Id: I434ca2a72c035f457bd50ef5de20e62f89974e0c

ansible/roles/ceph/templates/ceph.conf.j2

@@ -20,5 +20,5 @@ mon compact on start = true
 host = {{ hostvars[inventory_hostname]['ansible_' + storage_interface]['ipv4']['address'] }}
 keyring = /etc/ceph/ceph.client.radosgw.keyring
 log file = /var/log/radosgw/client.radosgw.gateway.log
-rgw frontends = civetweb port={{ hostvars[inventory_hostname]['ansible_' + storage_interface]['ipv4']['address'] }}:{{ rgw_port }}
+rgw frontends = civetweb port={{ rgw_port }}
 {% endif %}