[issue30223] Add Lib/test/__main__.py in 2.7

[Nick Coghlan]

Nick Coghlan added the comment:

+1 from me. We hadn't done this (or the test.support backport) previously due to the "no new features" guideline, but I think simplifying cross-branch maintenance overrides that concerns.

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<http://bugs.python.org/issue30223>
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