update the network design to make support easier and cleaner

Change-Id: Iddf25266e3fd534ba88887acb7116faa04224c39
(cherry picked from commit c15f8e1231905cb83e0db014b8c1b3d7c72b23f0)
diff --git a/bootstrap/bootstrap.py b/bootstrap/bootstrap.py
index 4c00853..c7a0826 100755
--- a/bootstrap/bootstrap.py
+++ b/bootstrap/bootstrap.py
@@ -290,7 +290,7 @@
         hostIfc = ifc if ifc['name'] == config['bridge'] else hostIfc
 
     add_or_update_node_group_interface(client, ng, config['gw'], localIfc, config['interface'], config['network'])
-    add_or_update_node_group_interface(client, ng, config['gw'], hostIfc, config['bridge'], config['bridge-subnet'])
+    #add_or_update_node_group_interface(client, ng, config['gw'], hostIfc, config['bridge'], config['bridge-subnet'])
 
     # Update the server settings to upstream DNS request to Google
     # POST /api/2.0/maas/ op=set_config