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

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> Typical example: (... smtplib ...)

Another example (yesterday):
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[355/356/2] test_subprocess
...
Re-running test test_subprocess in verbose mode
...
Ran 228 tests in 322.313s

OK (skipped=20)
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12400>
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