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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Oh, it is so easy to break test_xpickle. But I think this test is very important. It is pity that test_xpickle is removed in 3.x.

I hope PR 1395 will fix test_xpickle.

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