OAK-1143: [scala] Repository init throws "illegal cyclic reference involving class ChangeDispatcher" Make ChangeDispatcher
NodeStoreTest.afterCommitHook fails intermittently since the observer might now pass the same root node state in subsequent calls.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1541069 13f79535-47bb-0310-9956-ffa450edef68