remove unused imports

git-svn-id: https://svn.apache.org/repos/asf/archiva/redback/redback-components/trunk@1546478 13f79535-47bb-0310-9956-ffa450edef68
use JobBuilder

git-svn-id: https://svn.apache.org/repos/asf/archiva/redback/redback-components/trunk@1546479 13f79535-47bb-0310-9956-ffa450edef68
remove old plexus javadoc

git-svn-id: https://svn.apache.org/repos/asf/archiva/redback/redback-components/trunk@1546480 13f79535-47bb-0310-9956-ffa450edef68