use our own RBACManager to be able to configure dynamically real impls used

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1433553 13f79535-47bb-0310-9956-ffa450edef68
add class

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1433554 13f79535-47bb-0310-9956-ffa450edef68