OAK-659 Move purge logic for transient changes below the NodeBuilder interface
revert changes from revisions 1513469, 1513503, 1513767, 1513791, 1513891, 1513924, 1514190, 1514191, 1514206, 1514217

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1514283 13f79535-47bb-0310-9956-ffa450edef68