Title: #616: Simplify KRA transport cert cache
* patches targeted at backport branches should be as small as possible,
* it's hard to see what is an actual change and what is just a formatting /
* the formatting changes do not add any value, the code is already PEP8
* using a mapping interface is KISS too.
I don't think this needs to be discussed further, either do the requested
changes or this PR won't be merged.
See the full comment at
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