[VFS-523] HdfsFileObject uses super equals/hashcode like all FOs

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1642530 13f79535-47bb-0310-9956-ffa450edef68
[VFS-487] DefaultFileMonitor detect re-creation events

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1642533 13f79535-47bb-0310-9956-ffa450edef68