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

[Roundup Robot]

Roundup Robot added the comment:

New changeset e5165dcae942 by Victor Stinner in branch 'default':
Issue #25220: Add test for --wait in test_regrtest
https://hg.python.org/cpython/rev/e5165dcae942

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