[issue30383] [3.5] Backport regrtest features from master to Python 3.5

[STINNER Victor]

New submission from STINNER Victor:

bpo-30283 backported regrtest features from master to Python 2.7. I now propose to do the same for Python 3.5, as suggested by Serhiy Storshaka.

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components: Tests
messages: 293827
nosy: haypo
priority: normal
severity: normal
status: open
title: [3.5] Backport regrtest features from master to Python 3.5
versions: Python 3.5

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<http://bugs.python.org/issue30383>
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