no need to read the configuration every time

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1436467 13f79535-47bb-0310-9956-ffa450edef68
use cache per default

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1436468 13f79535-47bb-0310-9956-ffa450edef68
implements those methods directly as it is faster that getting all roles

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1436469 13f79535-47bb-0310-9956-ffa450edef68