OAK-1313: Process does not exit after benchmark run

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1556779 13f79535-47bb-0310-9956-ffa450edef68
fix Javadoc, remove unused imports

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1556785 13f79535-47bb-0310-9956-ffa450edef68