Move derby.log into target.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1450160 13f79535-47bb-0310-9956-ffa450edef68
Drop obsolete folders.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/vfs@1450162 13f79535-47bb-0310-9956-ffa450edef68