[issue21976] Fix test_ssl.py to handle LibreSSL versioning appropriately

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +christian.heimes, dstufft, giampaolo.rodola, pitrou
versions:  -Python 3.1, Python 3.2, Python 3.3

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<http://bugs.python.org/issue21976>
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