JarWithOneNonDisabledDigestAlg could be made easier to follow

[Eirik Bjørsnøs]

Hi,

While reviewing the JarWithOneNonDisabledDigestAlg test, I found that the
code could perhaps be easier to follow if some updates would be made in the
choice of keystore naming and choice of algorithms.

I also found potential for some more general code cleanups, and also a way
to move expectations of signing counts out of checkThatJarIsSigned method.

Knowing well that this fixes no bug, I wanted to hear what people think
about the usefulness of such changes before I go the JBS route with a
proper PR.

Here's a draft PR with my proposed changes:

https://github.com/openjdk/jdk/pull/11997

Cheers,
Eirik.
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