Remove com.sun.jarsigner package with related options

[Eirik Bjørsnøs]

>
> This needs a CSR and a release note. Do you volunteer to write them? If
> yes, you can write as comments in the PR and I can move them into JBS. You
> can look at the CSRs for the 2 related bugs.
>

Thanks Weijun! Happy to write the CRS and release notes, I have included
them as comments in the PR.

Note that this is my first time writing an OpenJDK CSR or release note, so
I might have missed some required field or perhaps not following the
preferred writing style.

Cheers,
Eirik.
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