[jdk21u-dev] RFR: 8281658: Add a security category to the java -XshowSettings option

[Andrew Lu]

I backport this for parity with 21.0.3-oracle.

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

Commit messages:
 - Backport 2e12a123c9955b7360fd752a6a33d59b6271c5af

Changes: https://git.openjdk.org/jdk21u-dev/pull/478/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=478&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281658
  Stats: 320 lines in 5 files changed: 314 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/478.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/478/head:pull/478

PR: https://git.openjdk.org/jdk21u-dev/pull/478