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

[Eli Bendersky]

Eli Bendersky added the comment:

> I thing the AddressFamily enum class and the family property should be
> documented.
>

I'm leaving the documentation to the end when we decide on the
implementation strategy. Once that happens I'll post a patch with .rst
changes, etc.

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<http://bugs.python.org/issue18720>
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