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

Change-Id: I9c57a01b4e9f3b5cc03a7618ac8b7af1d227ab76
diff --git a/ceilometer/server/single.yml b/ceilometer/server/single.yml
index 5f56244..505f0c0 100644
--- a/ceilometer/server/single.yml
+++ b/ceilometer/server/single.yml
@@ -1,8 +1,12 @@
 classes:
 - service.ceilometer.server.single
 parameters:
+  _param:
+    openstack_rabbitmq_port: 5672
   ceilometer:
     server:
+      message_queue:
+        port: ${_param:openstack_rabbitmq_port}
       role: ${_param:openstack_node_role}
       database:
         influxdb: