RFR 8067112: Update jdk/test/java/util/Collections/EmptyIterator.java to eliminate dependency on sun.tools.java

[Amy Lu]

Please review the fix for removing internal JDK API dependency from test 
java/util/Collections/EmptyIterator.java

This test has dependency on sun.tools.java from one of it’s test case, 
this fixed by using public API for the same testing purpose.

bug: https://bugs.openjdk.java.net/browse/JDK-8067112
webrev: http://cr.openjdk.java.net/~weijun/8067112/webrev.00/

Thanks,
Amy