Merged revisions 87238 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r87238 | r.david.murray | 2010-12-14 11:20:53 -0500 (Tue, 14 Dec 2010) | 7 lines

  #775964: skip YP/NIS entries instead of failing the test

  Also includes doc updates mentioning that these entries may not
  be retrievable via getgrnam and getgrgid.

  Patch by Bobby Impollonia.
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