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

[Sean Coffey]

> 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

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15001/files
  - new: https://git.openjdk.org/jdk/pull/15001/files/688b856d..2df0f0a7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15001&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15001&range=01-02

  Stats: 19144 lines in 255 files changed: 7666 ins; 10330 del; 1148 mod
  Patch: https://git.openjdk.org/jdk/pull/15001.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15001/head:pull/15001

PR: https://git.openjdk.org/jdk/pull/15001