[issue7878] regrtest should check for changes in import machinery

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[issue7878] regrtest should check for changes in import machinery

New submission from Brett Cannon : The saved_test_environment context manager should check that sys.path_hooks, sys.path_importer_cache, and __import__ have not changed. The thing that is tricky, though, is that sys.path_importer_cache is legitimately mutated by other tests simply because vali