OAK-1990 - Utility js methods to manage Oak data in Mongo

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1613379 13f79535-47bb-0310-9956-ffa450edef68
OAK-1990 - Utility js methods to manage Oak data in Mongo

Make utility methods private

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1613380 13f79535-47bb-0310-9956-ffa450edef68