[issue30664] Change unittest's _SubTest to not sort its params when printing test failures

[Louie Lu]

Louie Lu added the comment:

I think the question will be, when using multiple subTest (this is why using ChainMap I think), how to determine their order?:

    with self.subTest(c=i, b=i, a=i):
        with self.subTest(b=i, c=50, a=60):
	    self.assertEqual(i, 2)


>>> FAIL: test_foo (__main__.Test) (a=60, b=4, c=50)

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nosy: +louielu

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<http://bugs.python.org/issue30664>
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