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

[Nick Coghlan]

Nick Coghlan added the comment:

New tests please - we want to make sure these keep working unless/until we reach agreement to actually remove them, and I'd prefer not to raise any new barriers to migration from Python 2.6/7 until 3.6 at the earliest :)

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