hg: jdk/sandbox: 8231706: change "Java" dir to "app" dir in jpackage app image

[andy.herrick at oracle.com]

Changeset: 0d95b41d0895
Author:    herrick
Date:      2019-10-03 11:04 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/0d95b41d0895

8231706: change "Java" dir to "app" dir in jpackage app image
Submitted-by: almatvee
Reviewed-by: herrick, asemenyuk

! src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/MacAppImageBuilder.java
! src/jdk.jpackage/macosx/native/libapplauncher/MacPlatform.mm
! src/jdk.jpackage/share/classes/jdk/jpackage/internal/ApplicationLayout.java
! test/jdk/tools/jpackage/helpers/JPackagePath.java