add some informations for ui dynamic choose for rbacmanager implementations

git-svn-id: https://svn.apache.org/repos/asf/archiva/redback/redback-core/trunk@1447149 13f79535-47bb-0310-9956-ffa450edef68
[MRM-1747] really use last modello snapshot

git-svn-id: https://svn.apache.org/repos/asf/archiva/redback/redback-core/trunk@1447150 13f79535-47bb-0310-9956-ffa450edef68