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

[Nick Coghlan]

Nick Coghlan added the comment:

While there are some remaining buildbot failures, they don't appear to be related to this issue any more.

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resolution:  -> fixed
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15415>
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