OAK-1133: Observation listener PLUS
Add FilterBuilder for building observation filters

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1550754 13f79535-47bb-0310-9956-ffa450edef68
OAK-1133: Observation listener PLUS
Replace JcrFilterProvider by using the new FilterBuilder

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1550755 13f79535-47bb-0310-9956-ffa450edef68