Insert a try except to avoid code breakage when removing a non-existent acl. It also moves build acl action to the loop outside to make API faster

Author: Leopoldo

networkapi/plugins/SDN/ODL/Generic.py

@@ -91,7 +91,6 @@ def del_flow(self, flow_id=0, nodes_ids=[]):
         except Exception as err:
             message = self._parse_errors(err.response.json())
             log.error("ERROR while removing a flow due to It does not exist anymore: %s" % message)
-
             pass