RFR: JDK-8224486: Arguments from jpackager cfg file not processed correctly

[Alexander Matveev]

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).

- Duplicated Java options were not read correctly from OrderedMap, 
instead we read only unique from map. Fixed by reading duplicated Java 
options.

[1] https://bugs.openjdk.java.net/browse/JDK-8224486
[2] http://cr.openjdk.java.net/~almatvee/8224486/webrev.00/

Thanks,
Alexander