RFR: JDK-8238692: MacOS runtime Installer issue

[Andy Herrick]

Please review the jpackage fix at [1] for the related issues [2], [3], 
and [4].

This will basically make pkg type runtime installers work on macosx, 
while we wait for JDK-8237971 to either fix or disable dmg type runtime 
installers.

/Andy

[1] http://cr.openjdk.java.net/~herrick/8238692/webrev.02/

[2] https://bugs.openjdk.java.net/browse/JDK-8238692

[3] https://bugs.openjdk.java.net/browse/JDK-8237966

[4] https://bugs.openjdk.java.net/browse/JDK-8237970