Setting for limiting receive_queue

There is no configuration param for overriding receive_queue in client protocol:

    def connection_made(self, transport):
        self.transport = transport

        self.receive_queue = deque()
        self._consume()

        try:
            peer = transport.get_extra_info('peername')
            try:
                # FIXME: tcp4 vs tcp6
                self.peer = u"tcp:%s:%d" % (peer[0], peer[1])
            except:
                # e.g. Unix Domain sockets don't have host/port
                self.peer = u"unix:{0}".format(peer)
        except:
            self.peer = u"?"

        self._connectionMade()

Should be:

self.receive_queue = deque(maxlen=MAX_QUEUE_LENGTH)

Start at the client protocol's connection_made entry point shown in the issue and trace how receive_queue is consumed and whether existing configuration is passed into the protocol. Implement the configurable queue limit and verify that the queue remains bounded under incoming messages; the payload does not name a test file.