Manually configurable ZooKeeper 3.4.x compatibility

static {
        boolean localHasZooKeeperAdmin;
        try
        {
            Class.forName("org.apache.zookeeper.admin.ZooKeeperAdmin");
            localHasZooKeeperAdmin = true;
        }
        catch ( ClassNotFoundException e )
        {
            localHasZooKeeperAdmin = false;
            logger.info("Running in ZooKeeper 3.4.x compatibility mode");
        }
        hasZooKeeperAdmin = localHasZooKeeperAdmin;
}