OAK-51 : Access Control Management (WIP)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1450128 13f79535-47bb-0310-9956-ffa450edef68
minor improvement: add annotations

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1450129 13f79535-47bb-0310-9956-ffa450edef68