[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset 2c1c2ca2548f943d6323859f17612aa5a4a19165 by Victor Stinner in branch '3.6':
[3.6] bpo-31234: Join threads in tests (#3589)
https://github.com/python/cpython/commit/2c1c2ca2548f943d6323859f17612aa5a4a19165


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<https://bugs.python.org/issue31234>
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