[jdk17u-dev] RFR: 8282007: Assorted enhancements to jpackage testing framework

[Goetz Lindenmaier]

I would like tot backport this because it simplifies later backports. Test only.

AdditionalLauncher.java: setShortcuts() is not in 17, applied patch to neighbouring
methods and omitted setShortcuts()
LinuxHelper: trivial resolve because of context.

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Commit messages:
 - Backport cd234f5dbebd18ebf0c78dfdf533318cdc627971

Changes: https://git.openjdk.org/jdk17u-dev/pull/578/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=578&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8282007
  Stats: 740 lines in 17 files changed: 416 ins; 179 del; 145 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/578.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/578/head:pull/578

PR: https://git.openjdk.org/jdk17u-dev/pull/578