[issue21119] asyncio create_connection resource warning

[STINNER Victor]

STINNER Victor added the comment:

BaseEventLoop.create_datagram_endpoint() and _UnixSelectorEventLoop.create_unix_server() have the same bug.

close2.patch fixes these methods but also modify socketpair() to ensure that the 2 sockets are closed on error.

I didn't audit the whole asyncio module.

Note: BaseEventLoop.create_server() uses a different approach: a "completed" flag with a try/finally block.

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Added file: http://bugs.python.org/file34725/close2.patch

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