code: def DbUnExportServer(self, argin):
          
          self._log.debug("In DbUnExportServer()")
          self.db.unexport_server(argin)
docs: Mark all devices belonging to a specified device server
          process as non exported
  
          :param argin: Device server name (executable/instance)
          :type: tango.DevString
          :return:
          :rtype: tango.DevVoid