Tweak config_entries tests

[emontnemery]

Proposed change

Small tweaks of config_entries tests:

• Rename some test functions
• Sort asserts in one test
• Fix a race in one test

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• Code quality improvements to existing code or addition of tests

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• This PR fixes or closes issue: fixes #
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[davet2001]

Thanks! I just had one minor comment...

[davet2001]

Is this doing anything more than being a simple counter?

If so, maybe an integer counter or boolean flag would be equivalent?

[emontnemery]

Yeah, that's right, but we use this pattern instead of a nonlocal int counter in quite a lot of tests already.
I'll change to a nonlocal counter if you think that's better?