add ldap bind authenticator enabled as a archiva config

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1445544 13f79535-47bb-0310-9956-ffa450edef68
modify ldap bind authenticator enabled with the ui

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1445545 13f79535-47bb-0310-9956-ffa450edef68