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

[Nick Coghlan]

Nick Coghlan added the comment:

I did see the Windows buildbot failure, but stopped scanning the log once I saw the intermittent test_signal failure :P

With the more granular API, test_startfile is a better fit for support.change_cwd, so we'll see how that goes on the Windows buildbots.

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