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

[Ethan Furman]

Ethan Furman added the comment:

Eli Bendersky added the comment:
>
> Another issue is _intenum_converter. Ethan - do you think it belongs in the enum module as a helper function or something of the sort?

I'm fine with it being a non-public member of enum, although if we had a place for miscellaneous tools that might be a 
better spot for it.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18720>
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