[issue7058] Add some test execution environment protection to regrtest

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

The cwd should also be checked/restored to avoid problems like #7066.

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nosy: +ezio.melotti

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7058>
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