RFR: 8271170: Add unit test for what jpackage app launcher puts in the environment [v3]

[Alexey Semenyuk]

On Wed, 11 Aug 2021 15:20:00 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:
> 
>   Removed unused output to file in the new PrintEnv test app.

These changes will be pushed after https://bugs.openjdk.java.net/browse/JDK-8272328 is fixed.

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