[issue16715] Get rid of IOError. Use OSError instead

[Roundup Robot]

New submission from Roundup Robot:

New changeset 7d69d04522e3 by Andrew Svetlov in branch 'default':
Replace IOError with OSError (#16715)
http://hg.python.org/cpython/rev/7d69d04522e3

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16715>
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