[issue19239] add inspect functions to retrieve attributes from both old dir() and overridden dir()

[Yury Selivanov]

Changes by Yury Selivanov <yselivanov.ml at gmail.com>:


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nosy: +yselivanov
versions: +Python 3.5 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19239>
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