[issue25220] Enhance and refactor test.regrtest (convert regrtest.py to a package)

[STINNER Victor]

STINNER Victor added the comment:

Another recent example:

http://buildbot.python.org/all/builders/AMD64%20Windows7%20SP1%203.x/builds/6712/steps/test/logs/stdio

...
[395/399] test_asyncio
[396/399] test_email
[397/399] test_threaded_import
[398/399] test_tools

command timed out: 3900 seconds without output, attempting to kill
program finished with exit code 1
elapsedTime=4958.515000

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<http://bugs.python.org/issue25220>
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