JDK 9 test-only RFR of 8179247: java/util/zip/TestExtraTime.java: add some instrumentation which might illuminate the failure of 2016-09-14

[Brian Burkhalter]

This might not be enough or might be totally unnecessary but could prove useful.

https://bugs.openjdk.java.net/browse/JDK-8179247
http://cr.openjdk.java.net/~bpb/8179247/webrev.00/

Thanks,

Brian