[issue21099] Switch applicable importlib tests to use PEP 451 API

[Roundup Robot]

Roundup Robot added the comment:

New changeset fceaa0dc715e by Eric Snow in branch 'default':
Issue #21099: Switch applicable importlib tests to use PEP 451 API.
https://hg.python.org/cpython/rev/fceaa0dc715e

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nosy: +python-dev

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<http://bugs.python.org/issue21099>
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