Add nova service user metadata

Enable nova service user by default

Change-Id: I42ac5f7b5ae54fb20ee2f1fd822ac76ee87c938a
Related-Prod: PROD-27591
diff --git a/nova/control/single.yml b/nova/control/single.yml
index d2cb013..0108af6 100644
--- a/nova/control/single.yml
+++ b/nova/control/single.yml
@@ -26,6 +26,8 @@
       identity:
         protocol: ${_param:cluster_internal_protocol}
         region: ${_param:openstack_region}
+      service_user:
+        enabled: ${_param:nova_service_user_enabled}
       network:
         protocol: ${_param:cluster_internal_protocol}
         region: ${_param:openstack_region}