RFR 8141521: jrt file system's DirectoryStream reports child paths with wrong paths for directories under /packages

[Sundararajan Athijegannathan]

Please review http://cr.openjdk.java.net/~sundar/8141521/webrev.00/ for 
https://bugs.openjdk.java.net/browse/JDK-8141521

Thanks
-Sundar