[issue7523] add SOCK_NONBLOCK and SOCK_CLOEXEC to socket module

[lekma]

lekma <lekmalek at gmail.com> added the comment:

better patch (mainly test refactoring).
still against trunk.

should I provide one against py3k?

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components: +IO
Added file: http://bugs.python.org/file15578/Issue7523_2.diff

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