[issue15496] harden directory removal for tests on Windows

[Jeremy Kloth]

Jeremy Kloth added the comment:

I must also add that the proposed solution works well within the test suite as the access denied error can also occur when creating subsequent files, not just removing them.

This solution eliminates the need to wrap all creation calls with access denied handling, a huge plus IMHO.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15496>
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