Make maas saltstack_repo's logic more general

Change-Id: I71021489b79c27d9b46b796c34ded21c4ee6d734
diff --git a/_states/maasng.py b/_states/maasng.py
index 40ec9a4..31f8af6 100644
--- a/_states/maasng.py
+++ b/_states/maasng.py
@@ -567,7 +567,7 @@
 
     if __opts__['test']:
         ret['result'] = None
-        ret['comment'] = 'fabric {0} will be updated for {1}'.format(vlan, name)
+        ret['comment'] = 'fabric {0} will be updated'.format(name)
         return ret
     # All requested subnets
     _r_subnets = __salt__['config.get']('maas').get('region', {}).get('subnets',