[issue37890] Modernize several tests in test_importlib

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

1) __import__() can be used for purpose. I would not change this.

3) How would you distinguish the case when the module have an attribute with the value is None and when it does not have the attribute at all? This information would lost with your change.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue37890>
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