[issue22293] unittest.mock: use slots in MagicMock to reduce memory footprint

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


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stage:  -> needs patch
versions: +Python 3.5 -Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22293>
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