RFR: 8372290: jpackage test lib improvements [v2]

[Alexander Matveev]

On Thu, 20 Nov 2025 18:48:29 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

>> 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
>>  - Reduce code duplication in LauncherAsServiceVerifier.java
>
> Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:
> 
>   AdditionalLauncher: use Slot class

Looks good.

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Marked as reviewed by almatvee (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28439#pullrequestreview-3491134615