[issue15284] Handle ipv6 not being enabled in test_socket

[Antoine Pitrou]

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


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stage:  -> patch review
type:  -> behavior
versions: +Python 3.3 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15284>
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