[issue30357] test_thread should clean threads after each test

[STINNER Victor]

STINNER Victor added the comment:


New changeset f8d05b3a24e745ab4a974b891ac1389e2f11ce4d by Victor Stinner in branch 'master':
bpo-30387: Fix warning in test_threading (#1634)
https://github.com/python/cpython/commit/f8d05b3a24e745ab4a974b891ac1389e2f11ce4d


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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30357>
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