[issue7058] Add some test execution environment protection to regrtest

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Here is a finished version of the refactoring patch.  It introduces a
new category in the list of test statuses at in the summary to list the
tests that have changed the execution environment.  This patch makes it
easy to add additional things to check and restore, and I've added
'sys.path' checking.

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Added file: http://bugs.python.org/file15107/refactored_environment_checking.patch

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