send ping packet to tarantool server and receive response with empty body

def ping(self):
        """
        send ping packet to tarantool server and receive response with empty body
        """
        d = self.replyQueue.get_ping()
        packet = RequestPing(self.charset, self.errors)
        self.transport.write(bytes(packet))
        return d.addCallback(self.handle_reply, self.charset, self.errors, None)