docs: async def ssh_exec(server, cmd, timeout=10, **ssh_kwargs):
      """Execute a command on a given server using asynchronous SSH-connection.
  
      The connection to the server is wrapped in :func:`asyncio.wait_for` and
      given :attr:`timeout` is applied to it. If the server is not reachable
      before timeout expires, :exc:`asyncio.TimeoutError` is raised.
  
      :param str server: Address of the server
      :param str cmd: Command to be executed
      :param int timeout: Timeout to connect to server.
  
      :param ssh_kwargs:
          Any additional SSH-connection arguments, as specified by
          :func:`asyncssh.connect`. See `asyncssh documentation
          <http://asyncssh.readthedocs.io/en/latest/api.html#connect>`_ for
          details.
  
      :returns:
          closed SSH-connection
      """
      conn = await asyncio.wait_for(asyncssh.connect(server, **ssh_kwargs),
                                    timeout=timeout)
      ret = await conn.run(cmd)
      conn.close()
      return ret