[issue7712] Add a context manager to change cwd in test.test_support and run the test suite in a temp dir.

[Florent Xicluna]

Florent Xicluna <laxyf at yahoo.fr> added the comment:

Let's fix some other tests.

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Added file: http://bugs.python.org/file16167/issue7712_context_manager_v5.diff

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