Unhard-coded 'message_queue:port:${_param:rabbitmq_port}'

Change-Id: I9c57a01b4e9f3b5cc03a7618ac8b7af1d227ab76
diff --git a/neutron/gateway/cluster.yml b/neutron/gateway/cluster.yml
index 60fc4e5..03ab583 100644
--- a/neutron/gateway/cluster.yml
+++ b/neutron/gateway/cluster.yml
@@ -7,6 +7,7 @@
     neutron_enable_vlan_aware_vms: False
     openstack_rabbitmq_x509_enabled: False
     rabbitmq_ssl_enabled: False
+    openstack_rabbitmq_port: 5672
   linux:
     system:
       kernel:
@@ -21,6 +22,7 @@
       backend:
         tenant_network_types: ${_param:neutron_tenant_network_types}"
       message_queue:
+        port: ${_param:openstack_rabbitmq_port}
         members:
           - host: ${_param:openstack_message_queue_node01_address}
           - host: ${_param:openstack_message_queue_node02_address}