RFR: JDK-8230927 : Wrong arguments set for additional launchers

[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 change applies when arguments or java-options are used in an 
add-launcher properties file.

In these cases the arguments or java-options from the properties files 
should replace instead of being added to the same options used in the 
command line  for the main launcher.

[1] https://bugs.openjdk.java.net/browse/JDK-8230927

[2] http://cr.openjdk.java.net/~herrick/8230927

/Andy