Fix p9 integration of flipcall.

- Do not call Rread.SetPayload(flipcall packet window) in p9.channel.recv().

- Ignore EINTR from ppoll() in p9.Client.watch().

- Clean up handling of client socket FD lifetimes so that p9.Client.watch()
  never ppoll()s a closed FD.

- Make p9test.Harness.Finish() call clientSocket.Shutdown() instead of
  clientSocket.Close() for the same reason.

- Rework channel reuse to avoid leaking channels in the following case (suppose
  we have two channels):

  sendRecvChannel
    len(channels) == 2 => idx = 1
    inuse[1] = ch0
                                        sendRecvChannel
                                          len(channels) == 1 => idx = 0
                                          inuse[0] = ch1
    inuse[1] = nil
  sendRecvChannel
    len(channels) == 1 => idx = 0
    inuse[0] = ch0
                                          inuse[0] = nil
    inuse[0] == nil => ch0 leaked

- Avoid deadlocking p9.Client.watch() by calling channelsWg.Wait() without
  holding channelsMu.

- Bump p9test:client_test size to medium.

PiperOrigin-RevId: 270200314

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