OAK-641: Improved benchmark tooling - bugfix

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1528767 13f79535-47bb-0310-9956-ffa450edef68
OAK-1073 : PrivilegeManager#getPrivilege throws RepositoryException rather than AccessControlException

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1528768 13f79535-47bb-0310-9956-ffa450edef68