RFR: JDK-8229779: Shortcut creation policy

[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 fix:

1.) adds the new option --linux-shortcut, and now only creates a 
shortcut on linux if specified

2.) only creates a shortcut on windows if win-menu or win-shortcut is 
specified.

/Andy


[1] https://bugs.openjdk.java.net/browse/JDK-8229779

[2] http://cr.openjdk.java.net/~herrick/8229779