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

[Eli Bendersky]

Eli Bendersky added the comment:

> What about SOCK_STREAM, SOCK_DGRAM, and SOCK_RAW?
>

This is a proof of concept. As I mentioned in the original message starting
this issue - the SOCK_* constants will get the same treatment as AF_*
constants, once we decide what the right treatment is.

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