[issue17065] Fix sporadic buildbot failures for test_winreg

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0882960fa6df by R David Murray in branch '3.3':
#17065: Use process-unique key for winreg test.
http://hg.python.org/cpython/rev/0882960fa6df

New changeset c7806d1b09eb by R David Murray in branch 'default':
Merge #17065: Use process-unique key for winreg test.
http://hg.python.org/cpython/rev/c7806d1b09eb

New changeset c0cb78bedc2b by R David Murray in branch '2.7':
#17065: Use process-unique key for winreg test.
http://hg.python.org/cpython/rev/c0cb78bedc2b

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nosy: +python-dev

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<http://bugs.python.org/issue17065>
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