RFR: 8271170: Add unit test for what jpackage app launcher puts in the environment [v2]

[Andy Herrick]

On Mon, 9 Aug 2021 18:19:03 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

>> Added jtreg test to verify jpackage launcher adds app dir to `java.library.path` system property.
>> Removed unused test/jdk/tools/jpackage/apps/installer/Hello.java.
>> Moved test/jdk/tools/jpackage/apps/image/Hello.java to test/jdk/tools/jpackage/apps/Hello.java.
>
> Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Handle duplicate elements in `java.library.path` system property value.

Marked as reviewed by herrick (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5056