RFR: JDK-8208652: JPackageCreateInstallerFileAssociationsTest.java fails on Mac.

[semyon.sadetsky at oracle.com]

Hello,

bug: https://bugs.openjdk.java.net/browse/JDK-8208652

webrev: http://cr.openjdk.java.net/~ssadetsky/8208652/webrev.00

It is a fix for a test issue on Mac. Unlikely other platforms Mac 
platform sends the file path to open in a special OS OpenFile event the 
application should handle. The test application was modified to handle 
this event.

--Semyon