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

Change-Id: I9c57a01b4e9f3b5cc03a7618ac8b7af1d227ab76
diff --git a/heat/server/single.yml b/heat/server/single.yml
index 9ef10c9..1ecb122 100644
--- a/heat/server/single.yml
+++ b/heat/server/single.yml
@@ -8,6 +8,7 @@
     openstack_rabbitmq_x509_enabled: False
     galera_ssl_enabled: False
     rabbitmq_ssl_enabled: False
+    openstack_rabbitmq_port: 5672
   linux:
     system:
       package:
@@ -37,6 +38,7 @@
         ssl:
           enabled: ${_param:galera_ssl_enabled}
       message_queue:
+        port: ${_param:openstack_rabbitmq_port}
         x509:
           enabled: ${_param:openstack_rabbitmq_x509_enabled}
           ca_file: ${_param:rabbitmq_heat_ssl_ca_file}