[issue43843] libregrtest: mark a test as failed if a thread logs an unexpected exception

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

test_concurrent_futures logs two warnings.

s390x Debian 3.x:
https://buildbot.python.org/all/#/builders/49/builds/1124

AMD64 RHEL7 3.x:
https://buildbot.python.org/all/#/builders/15/builds/1074

0:03:18 load avg: 4.78 [302/427] test_concurrent_futures passed (2 min 46 sec) -- running: test_tokenize (37.8 sec), test_peg_generator (59.2 sec)
Warning -- Uncaught thread exception: SystemExit
Warning -- Uncaught thread exception: SystemExit

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