TEST_BUG: Tests in java/util/zip/ZipFile leave file open

[Xueming Shen]

These tests leave either ZipFile or io stream open after testing, fail 
in samevm mode, so are not in
ProblemList.txt now. With the change they now all pass.
http://cr.openjdk.java.net/~sherman/6962067/webrev

Thanks,
-Sherman