OAK-659: Move purge logic for transient changes below the NodeBuilder interface

Use NodeBuilders instead of NodeStates in initializers

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1525140 13f79535-47bb-0310-9956-ffa450edef68
unused import

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1525141 13f79535-47bb-0310-9956-ffa450edef68