Delete an existing group dampening

        :param group_id: Group Trigger id to be retrieved
        :param dampening_id: id of the Dampening to be deleted

def delete_group_dampening(self, group_id, dampening_id):
        """
        Delete an existing group dampening

        :param group_id: Group Trigger id to be retrieved
        :param dampening_id: id of the Dampening to be deleted
        """
        self._delete(self._service_url(['triggers', 'groups', group_id, 'dampenings', dampening_id]))