[issue30158] Deprecation warnings emitted in test_importlib

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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stage:  -> patch review
versions:  -Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30158>
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