[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset 830d7d2936434ace113822294acce82f62cde41b by Victor Stinner in branch 'master':
bpo-31234: test_httpservers joins the server thread (#3188)
https://github.com/python/cpython/commit/830d7d2936434ace113822294acce82f62cde41b


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