[issue12400] regrtest: always run tests in verbose mode, but hide the output on success

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 80c7d63325f6 by Victor Stinner in branch 'default':
Issue #12400: fix test_faulthandler if regrtest captures sys.stderr
http://hg.python.org/cpython/rev/80c7d63325f6

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<http://bugs.python.org/issue12400>
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