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

Change-Id: I9c57a01b4e9f3b5cc03a7618ac8b7af1d227ab76
diff --git a/keystone/server/single.yml b/keystone/server/single.yml
index 03cd75d..10a5331 100644
--- a/keystone/server/single.yml
+++ b/keystone/server/single.yml
@@ -17,6 +17,7 @@
     openstack_rabbitmq_x509_enabled: False
     galera_ssl_enabled: False
     rabbitmq_ssl_enabled: False
+    openstack_rabbitmq_port: 5672
   linux:
     system:
       package:
@@ -62,6 +63,7 @@
       credential:
         location: /var/lib/keystone/credential-keys
       message_queue:
+        port: ${_param:openstack_rabbitmq_port}
         engine: rabbitmq
         host: ${_param:single_address}
         user: openstack