Make test harness cleanup temp dir

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1639949 13f79535-47bb-0310-9956-ffa450edef68
[VFS-545] Remove and avoid FileSystems in cache. Add/fix Javadoc, added Unittests.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1639972 13f79535-47bb-0310-9956-ffa450edef68
Additional Unit Tests

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1639974 13f79535-47bb-0310-9956-ffa450edef68
Tab police

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1639975 13f79535-47bb-0310-9956-ffa450edef68