OAK-641: Improved benchmark tooling - use a non-orderable parent node

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1534171 13f79535-47bb-0310-9956-ffa450edef68
OAK-641: Improved benchmark tooling - use different node names

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1534172 13f79535-47bb-0310-9956-ffa450edef68