code: def command_builder(self, string, value=None, default=None, disable=None):
          
          if default:
              return 'default %s' % string
          elif disable:
              return 'no %s' % string
          elif value is True:
              return string
          elif value:
              return '%s %s' % (string, value)
          else:
              return 'no %s' % string
docs: Builds a command with keywords
  
          Notes:
              Negating a command string by overriding 'value' with None or an
                  assigned value that evalutates to false has been deprecated.
                  Please use 'disable' to negate a command.
  
              Parameters are evaluated in the order 'default', 'disable', 'value'
  
          Args:
              string (str): The command string
              value (str): The configuration setting to subsititue into the
                  command string. If value is a boolean and True, just the
                  command string is used
              default (bool): Specifies the command should use the default
                  keyword argument. Default preempts disable and value.
              disable (bool): Specifies the command should use the no
                  keyword argument. Disable preempts value.
  
          Returns:
              A command string that can be used to configure the node