Fix maas dhcp update

  * TODO: currently, formula not able to set domain name for
    rackd|maas server.

Change-Id: Iebb59200949fbdf7acaca8bbb004996d1581deaf
diff --git a/_states/maasng.py b/_states/maasng.py
index c381a18..7b14f99 100644
--- a/_states/maasng.py
+++ b/_states/maasng.py
@@ -332,8 +332,7 @@
     return ret
 
 
-def vlan_present_in_fabric(name, fabric, vlan, description='',
-                           primary_rack='', dhcp_on=False):
+def vlan_present_in_fabric(name, fabric, vlan, primary_rack, description='', dhcp_on=False):
     """
 
     :param name: Name of vlan