[issue20556] Use specific asserts in threading tests

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Yes, I missed to remove one old assertion. Thanks Mark.

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versions: +Python 3.5, Python 3.6 -Python 3.3
Added file: http://bugs.python.org/file40102/test_threading_asserts_2.patch

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<http://bugs.python.org/issue20556>
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