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

[Roundup Robot]

Roundup Robot added the comment:

New changeset a9fe8cd339b1 by Victor Stinner in branch 'default':
Fix test_regrtest.test_tools_buildbot_test()
https://hg.python.org/cpython/rev/a9fe8cd339b1

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