Gateway ip is showns as None for subnet created with gateway_ip = '0.…

…0.0.0'

Fix _make_subnet_dict to not to update the gateway_ip
Closes-Bug: 1411796

Change-Id: Ib32160508f355e36945ae003c04d413592e40042

neutron_plugin_contrail/plugins/opencontrail/contrail_plugin.py

@@ -381,8 +381,6 @@ def create_subnet(self, context, subnet):
         return self._make_subnet_dict(subnet_created)
 
     def _make_subnet_dict(self, subnet):
-        if 'gateway_ip' in subnet and subnet['gateway_ip'] == '0.0.0.0':
-            subnet['gateway_ip'] = None
         return subnet
 
     def _get_subnet(self, context, subnet_id, fields=None):