Fetch statistics about a single tube

        :param tube_name: Tube to fetch stats about
        :rtype: dict

def stats_tube(self, tube_name):
        """Fetch statistics about a single tube

        :param tube_name: Tube to fetch stats about
        :rtype: dict
        """
        with self._sock_ctx() as socket:
            self._send_message('stats-tube {0}'.format(tube_name), socket)
            body = self._receive_data_with_prefix(b'OK', socket)
            return yaml_load(body)