def enable_root(host)
      if host['user'] != 'root'
        copy_ssh_to_root(host, @options)
        enable_root_login(host, @options)
        host['user'] = 'root'
        host.close
      end
    end
def enable_root(host)
      if host['user'] != 'root'
        copy_ssh_to_root(host, @options)
        enable_root_login(host, @options)
        host['user'] = 'root'
        host.close
      end
    end
enable root on a single host (the current one presumably) but only
 if the username isn't 'root'