RFR: JDK-8222733: Modify jpackage option --add-launcher syntax

[Andy Herrick]

Please review the jpackage fix for bugs [1] and [2] at [3].

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

[1] https://bugs.openjdk.java.net/browse/JDK-8222733

[2] https://bugs.openjdk.java.net/browse/JDK-8222731

[3] http://cr.openjdk.java.net/~herrick/8222733/

/Andy