OAK-2144: Intermittent Node not found at given revision with DocumentNodeStore

Merged revisions 1629688,1629840,1629917,1630156 from trunk

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1630372 13f79535-47bb-0310-9956-ffa450edef68