docs: def ssh_cmd(self, name, ssh_command):
          """
          SSH into given container and executre command if given
          """
          if not self.container_exists(name=name):
              exit("Unknown container {0}".format(name))
  
          if not self.container_running(name=name):
              exit("Container {0} is not running".format(name))
  
          ip = self.get_container_ip(name)
          if not ip:
              exit("Failed to get network address for "
                   "container {0}".format(name))
          if ssh_command:
              ssh.do_cmd('root', ip, 'password', " ".join(ssh_command))
          else:
              ssh.launch_shell('root', ip, 'password')