OAK-1459: Many extra events are dispatched from a move event
Split FatTreeFilter into AddSubtreeFilter and DeleteSubtreeFilter for filtering individual events of added and removed sub-trees, respectively

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1571748 13f79535-47bb-0310-9956-ffa450edef68