RFR: 8311653: Modify -XshowSettings launcher behavior [v3]

[Roger Riggs]

On Wed, 26 Jul 2023 09:22:14 GMT, Sean Coffey <coffeys at openjdk.org> wrote:

>> Modify the -XshowSettings launcher option to print non-verbose settings details of all components by default. Verbose settings details will be printed via the -XshowSettings:all option. Modify the -XshowSettings option to reject bad values passed to it. Print an error message in such scenarios and abort the VM launch.
>
> Sean Coffey has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:
> 
>  - Merge branch 'master' into 8311653-showSettings-tweak
>  - Incorporate changes from Mandys review
>  - Incorporate review feedback
>  - modify -X output for :all
>  - restore imports
>  - Abort if bad options input
>  - 8311653

Looks good

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15001#pullrequestreview-1548182284