[issue18720] Switch suitable constants in the socket module to IntEnum

[Eli Bendersky]

Eli Bendersky added the comment:

Attaching a new patch that uses Serhiy's suggestion to avoid the duplication, and uses Antoine's suggestion to keep socket.family working even if the family is an unknown numeric constant.

Note that the latter is challenging to test - I need families the OS knows and socket doesn't. Any suggestions are welcome. For the time being the test I cooked up is an abomination ;-)

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Added file: http://bugs.python.org/file31291/socket-intenum-af.3.patch

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