[issue775964] fix test_grp failing when NIS entries present

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

I'm able to, but I may not find time. Ask on python-dev; if you feel you need to push this, offer to review issues in return.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue775964>
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