RFR: JDK-8217751: jpackage messages and failures

[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).

RFR:  JDK-8217751: jpackage messages and failures
This is a fix to Error and Warning processing and Error message content.


[1] JDK-8217751 <https://bugs.openjdk.java.net/browse/JDK-8217751>

[2] http://cr.openjdk.java.net/~herrick/8217751/webrev.01/