RFR: 8231591: [TESTBUG] Create additional two phase jpackage tests [v4]

[Andy Herrick]

On Fri, 25 Sep 2020 01:08:52 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

>> https://bugs.openjdk.java.net/browse/JDK-8231591
>> 
>> - Added MultiLauncherTwoPhaseTest which uses predefine app image with multiple launcher and tests to make sure installer
>>   will create shortcuts for all launchers.
>> - Fixed Linux DesktopIntegration to create shortcuts for additional launcher if we using pre-define app image.
>
> Alexander Matveev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8231591: [TESTBUG] Create additional two phase jpackage tests (revision 3)

Marked as reviewed by herrick (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/263