Merged revisions 83643 via svnmerge from

Merged revisions 83643 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/release27-maint

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  r83643 | ronald.oussoren | 2010-08-03 09:31:12 +0200 (Tue, 03 Aug 2010) | 13 lines

  Merged revisions 83431 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/branches/py3k

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    r83431 | ronald.oussoren | 2010-08-01 21:18:13 +0200 (Sun, 01 Aug 2010) | 6 lines

    test_getgroups as introduced with issue7900 failed on systems
    where 'id -G' and posix.getgroups() returned the same information,
    but one of the sources contains duplicate information. Rewrite the
    check using sets instead of lists.
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