promote user to owner in stream

def promote_owner(self, stream_id, user_id):
        ''' promote user to owner in stream '''
        req_hook = 'pod/v1/room/' + stream_id + '/membership/promoteOwner'
        req_args = '{ "id": %s }' % user_id
        status_code, response = self.__rest__.POST_query(req_hook, req_args)
        self.logger.debug('%s: %s' % (status_code, response))
        return status_code, response