[issue16968] Fix test discovery for test_concurrent_futures.py

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

test_concurrent_futures was made discoverable by Victor Stinner in issue37421. It used tearDownModule() to run threading_cleanup() and reap_children().

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status: open -> pending

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue16968>
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