[issue7055] Automatic test___all__

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

There was a problem with os.environ (from distutils and CGIHTTPServer)
changes disturbing test_wsgiref, so I've added an unconditional
save/restore of os.environ in test.regrtest.

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Added file: http://bugs.python.org/file15040/test_all.patch

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