[issue8576] test_support.find_unused_port can cause socket conflicts on Windows

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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nosy: +brian.curtin, exarkun, tim.golden
type:  -> behavior
versions: +Python 2.6, Python 2.7, Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8576>
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