Networks, subnets and ports model updates

* Updating comments with @type
* Adding the self.kwargs attribute to the models (for checking unexpected response attributes)
* Adding the base config attribute check_response_attrs to enable/disable kwargs checks on responses

Change-Id: Id0fe18c6a83e91b4e95f9e630142b7fbbf2628c3
Merge "Networks, subnets and ports model updates"