[issue12054] test_socket: replace custom _get_unused_port() by support.find_unused_port()

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

An obvious one indeed, thank you :)

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nosy: +pitrou
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed
versions: +Python 3.2, Python 3.3

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<http://bugs.python.org/issue12054>
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