RFR: 8372290: jpackage test lib improvements

[Alexey Semenyuk]

Collect updates to jpackage test lib from different work-in-progress fixes:

 - ConfigFilesStasher: fix "ServiceTest.testAddLFromAppImage" test failure on Linux
 - Move PropertyFile class to the package level and make it not throw IOException
 - Update test/jdk/tools/jpackage/clean_stashed_files.sh and test/jdk/tools/jpackage/clean_test_output.sh scripts
 - CannedFormattedString: make it implement CannedArgument; add `addPrefix()`, and `mapArgs()`
 - JPackageCommand: add `makeError()` and `makeAdvice()`

Additionally, add a test case to the AppImagePackageTest test to test that jpackage placed launcher .so in the correct location when using the predefined app image and installing the "/usr" tree on Linux.

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Commit messages:
 - CannedArgument: fix the copyright year
 - ErrorTest: fix the merge
 - JPackageCommand: add makeError() and makeAdvice() functions
 - CannedFormattedString: make it implement CannedArgument; add addPrefix(), and mapArgs()
 - Fix cleanup scripts
 - Move PropertyFile to the package level and make it not throw IOException.
 - 8371384: libapplauncher.so is copied to a wrong location in two step packaging when --install-dir=/usr
 - LauncherAsServiceVerifier: reduce copy/paste code in launcherAsService()
 - ConfigFilesStasher: fix ServiceTest.testAddLFromAppImage test failure on Linux

Changes: https://git.openjdk.org/jdk/pull/28439/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28439&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372290
  Stats: 210 lines in 14 files changed: 145 ins; 48 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/28439.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28439/head:pull/28439

PR: https://git.openjdk.org/jdk/pull/28439