OAK-2232: External events incomplete

Ignored test to reproduce the issue

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1634841 13f79535-47bb-0310-9956-ffa450edef68
OAK-2234 - Support property existence query

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1634852 13f79535-47bb-0310-9956-ffa450edef68