[issue21566] make use of the new default socket.listen() backlog argument

[STINNER Victor]

STINNER Victor added the comment:

Maybe we should keep listen(1) in some cases.

For socketpair() of asyncio.windows_utils, it makes sense to use sock.listen(1) since we expect exactly one request from one client. The listening socket is closed just after sock.accept().

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<http://bugs.python.org/issue21566>
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