RFR: 8067889: 4 pack200 tests fail on mac since jdk became modular

[Kumar Srinivasan]

Hello,

Please review a simplification of the JAR locator service, with the 
modular JDK there
is no need to search for JARs in the jdk, the golden.jar exists in a 
well known place
simply use this location.

http://cr.openjdk.java.net/~ksrini/8067889/webrev.0/

Thanks
Kumar