RFR 8058855: Update java.util.zip tests to work with modular image

[Amy Lu]

Two java/util/zip tests use JDK rt.jar in test, this fix is to remove 
this dependency from test because with a modular rt.jar and the other 
JAR files in the JDK go away.

bug:    https://bugs.openjdk.java.net/browse/JDK-8058855
webrev: http://cr.openjdk.java.net/~tyan/amylu/8058855/webrev.00/
Thanks,
Amy