fix deadlock in test_remote_shutdown_receives_trailing_data

[xiacunshun]

The hanging is due to eof_received = threading.Lock() hold by client which is requested by server. The client keep the lock because the reader.read() does not return as expected. So I try to use asyncio.wait_for to make it return if nothing recieved.

[1st1]

@fantix please take a look

[xiacunshun]

Is there anyboby can deal with this?

[fantix]

Yeah, sorry for the delay! I'm looking into this.

[xiacunshun]

@fantix Is there any problem?

[xiacunshun]

@fantix