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

[Roundup Robot]

Roundup Robot added the comment:

New changeset a76693942de3 by Nick Coghlan in branch '3.3':
Attempt to fix #15415 on Windows
http://hg.python.org/cpython/rev/a76693942de3

New changeset b14308524cff by Nick Coghlan in branch 'default':
Merge #15415 Windows buildbot change from 3.3
http://hg.python.org/cpython/rev/b14308524cff

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