RFR: JDK-8233265: jpackage --add-modules cannot find additional modules with non-modular app

[Andy Herrick]

Please review the jpackage fix for bug [1] at [2].

This is a fix for the JDK-8200758-branch branch of the open sandbox 
repository (jpackage).

This is a fixes a regression from the fix to JDK-8231882 
<https://bugs.openjdk.java.net/browse/JDK-8231882> and improves behavior 
when module listed is not in the module path.

[1] https://bugs.openjdk.java.net/browse/JDK-8233265

[2] http://cr.openjdk.java.net/~herrick/8233265/

/Andy