[issue12191] Add shutil.chown to allow to use user and group name (and not only uid/gid)

[Sandro Tosi]

Sandro Tosi <sandro.tosi at gmail.com> added the comment:

after a review from Ezio (thanks!) we've come out with this updated patch; main changes are in the test suite, where now it's checked that chown() succeed. about !r/!a I've left !r; and changed the 2 ValueError in LookupError (the first, in case no arguments are passed, it's still there).

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Added file: http://bugs.python.org/file22864/shutil_chown-default-v6.patch

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