[issue14534] Add means to mark unittest.TestCases as "do not run".

[Robert Collins]

Robert Collins added the comment:

I'm going to review on rietvald - I see a lot of changes needed - sorry - and some are a bit bikesheddy. But, if we do them I'll commit it asap and do any final fixup needed.

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<http://bugs.python.org/issue14534>
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