OAK-829: ConstraintViolationException while retrieving definition for all nodes with name jcr:childNodeDefinition

Drop the index suffix from SNS names before looking up child node definitions.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1485150 13f79535-47bb-0310-9956-ffa450edef68