Verify ZipInputStream against upstream OpenJDK 8u121-b13

Made change markers follow the standard and updated comments to provide
more context. Also modified test slightly to give more information in
the event of failure.

Bug: 111061052
Test: no functional changes but used vogar to run zip tests
Change-Id: I1756af9b35afca442d761a7b3dfe088b9fb69230
2 files changed