[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:

test_threading.test_foreign_thread() failed:

http://buildbot.python.org/all/builders/AMD64%20FreeBSD%20CURRENT%20Debug%203.x/builds/879/steps/test/logs/stdio

0:08:53 load avg: 1.84 [286/405/1] test_threading failed (env changed) -- running: test_multiprocessing_spawn (51 sec)
(...)
test_dummy_thread_after_fork (test.test_threading.ThreadTests) ... ok
test_enumerate_after_join (test.test_threading.ThreadTests) ... ok
test_finalize_runnning_thread (test.test_threading.ThreadTests) ... ok
test_finalize_with_trace (test.test_threading.ThreadTests) ... ok
test_foreign_thread (test.test_threading.ThreadTests) ... Warning -- threading_cleanup() failed to cleanup 1 threads (count: 1, dangling: 1)
Dangling thread: <_MainThread(MainThread, started 34369060864)>
ok
test_frame_tstate_tracing (test.test_threading.ThreadTests) ... ok

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31234>
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