Merged revisions 85211 via svnmerge from

Merged revisions 85211 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r85211 | lars.gustaebel | 2010-10-04 17:18:47 +0200 (Mon, 04 Oct 2010) | 14 lines

  Issue #9065: no longer use "root" as the default for the
  uname and gname field.

  If tarfile creates a new archive and adds a file with a
  uid/gid that doesn't have a corresponding name on the
  system (e.g. because the user/group account was deleted) it
  uses the empty string in the uname/gname field now instead
  of "root". Using "root" as the default was a bad idea
  because on extraction the uname/gname fields are supposed
  to override the uid/gid fields. So, all archive members
  with nameless uids/gids belonged to the root user after
  extraction.
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