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

[Nick Coghlan]

Nick Coghlan added the comment:

No dice: http://buildbot.python.org/all/builders/AMD64%20Windows7%20SP1%203.x/builds/2399/steps/test/logs/stdio

Could someone with a Windows build set up try this out?

I'd like to rule out a conflict with the -j setting, since being dependent on the current working directory pretty much rules out being run in parallel with other tests, but I didn't see anything in regrtest that let me say "run this one before fanning out into parallel execution".

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