docs: def expect_retval(connection, command, expected_status=0, timeout=10):
          '''
          Run command and expect specified return valud
  
          @param connection: connection to the host
          @type connection: L{Connection}
  
          @param command: command to execute
          @type command: str
  
          @param expected_status: expected return value
          @type expected_status: int
  
          @param timeout: timeout for performing expect operation
          @type  timeout: int
  
          @return: return value
          @rtype: int
  
          @raises ExpectFailed
          '''
          retval = connection.recv_exit_status(command, timeout)
          if retval is None:
              raise ExpectFailed("Got timeout (%i seconds) while executing '%s'"
                                 % (timeout, command))
          elif retval != expected_status:
              raise ExpectFailed("Got %s exit status (%s expected)\ncmd: %s\nstdout: %s\nstderr: %s"
                                 % (retval, expected_status, connection.last_command,
                                    connection.last_stdout, connection.last_stderr))
          if connection.output_shell:
              sys.stdout.write("Run '%s', got %i return value\n"
                               % (command, retval))
          return retval