code: def get_ssh_subsystem_names(self):
          
          preferred_ssh_subsystem = self.device_params.get("ssh_subsystem_name")
          name_list = [ "netconf", "xmlagent" ]
          if preferred_ssh_subsystem:
              return [ preferred_ssh_subsystem ] + \
                          [ n for n in name_list if n != preferred_ssh_subsystem ]
          else:
              return name_list
docs: Return a list of possible SSH subsystem names.
  
          Different NXOS versions use different SSH subsystem names for netconf.
          Therefore, we return a list so that several can be tried, if necessary.
  
          The Nexus device handler also accepts