Delete an existing message type
        :param message_type_id: is the id of the message type the
                                client wants to delete

def delete_message_type(self, message_type_id):
        """
        Delete an existing message type
        :param message_type_id: is the id of the message type the
                                client wants to delete
        """
        self._validate_uuid(message_type_id)

        url = "/notification/v1/message-type/{}".format(message_type_id)
        response = NWS_DAO().deleteURL(url, self._write_headers())

        if response.status != 204:
            raise DataFailureException(url, response.status, response.data)
        return response.status