refresh labels list when create/remove label in the setting place, while remove label can not refresh now

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522381 13f79535-47bb-0310-9956-ffa450edef68
remove useless code

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522382 13f79535-47bb-0310-9956-ffa450edef68