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

Change-Id: I9c57a01b4e9f3b5cc03a7618ac8b7af1d227ab76
diff --git a/designate/server/single.yml b/designate/server/single.yml
index 1bb51cb..11bd1d1 100644
--- a/designate/server/single.yml
+++ b/designate/server/single.yml
@@ -7,6 +7,7 @@
     internal_protocol: 'http'
     openstack_mysql_x509_enabled: False
     galera_ssl_enabled: False
+    openstack_rabbitmq_port: 5672
   linux:
     system:
       package:
@@ -54,7 +55,7 @@
       message_queue:
         engine: rabbitmq
         host: ${_param:cluster_vip_address}
-        port: 5672
+        port: ${_param:openstack_rabbitmq_port}
         user: openstack
         password: ${_param:rabbitmq_openstack_password}
         virtual_host: '/openstack'