[issue24412] setUpClass equivalent for addCleanup

[Robert Collins]

Robert Collins added the comment:

It would be nice for symmetry. I mean, setUpClass isn't needed either, and we have it ;).

however, we actually have two contexts this would be called from - setUpClass and setUpModule; both share their internals. So we probably need a decoupled cleanups implementation, and two new binding points to it.

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<http://bugs.python.org/issue24412>
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