minor improvement, cleaning up TODOs

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1469848 13f79535-47bb-0310-9956-ffa450edef68
OAK-50 : Implement User Management  (cleaning up TODOs)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1469850 13f79535-47bb-0310-9956-ffa450edef68