[issue40173] test.support.import_fresh_module fails to correctly block submodules when fresh is specified

[Serhiy Storchaka]

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

I just encountered this bug after rewriting datetime tests in issue45229. It is also the cause of issue40058.

Not knowing about this issue I have wrote different patch than Hai Shi. It makes the code of import_fresh_module() clearer and fixes many other issues.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue40173>
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