[issue15415] Add temp_dir() and change_cwd() to test.support

[Indra Talip]

Indra Talip added the comment:

cleaning up patch so that it will apply cleanly after applying patch from issue15494

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nosy: +italip
Added file: http://bugs.python.org/file30858/issue-15415-4.patch

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<http://bugs.python.org/issue15415>
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