[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset 6c25b73194714e78975eddea3799f06f3de74647 by Victor Stinner (Miss Islington (bot)) in branch '3.6':
[3.6] bpo-31234: test_httpservers joins the server thread (GH-3188) (#3536)
https://github.com/python/cpython/commit/6c25b73194714e78975eddea3799f06f3de74647


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