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

Change-Id: I9c57a01b4e9f3b5cc03a7618ac8b7af1d227ab76
diff --git a/nova/compute/single.yml b/nova/compute/single.yml
index 5f4f8ef..32d5087 100644
--- a/nova/compute/single.yml
+++ b/nova/compute/single.yml
@@ -39,6 +39,7 @@
     cluster_internal_protocol: 'http'
     openstack_rabbitmq_x509_enabled: False
     rabbitmq_ssl_enabled: False
+    openstack_rabbitmq_port: 5672
   openssh:
     client:
       enabled: True
@@ -75,7 +76,7 @@
       message_queue:
         engine: rabbitmq
         host: ${_param:control_address}
-        port: 5672
+        port: ${_param:openstack_rabbitmq_port}
         user: openstack
         password: ${_param:rabbitmq_openstack_password}
         virtual_host: '/openstack'