docs: def get_allowed_reset_keys_values(self):
          """Get the allowed values for resetting the system.
  
          :returns: A set with the allowed values.
          """
          reset_keys_action = self._get_reset_keys_action_element()
  
          if not reset_keys_action.allowed_values:
              LOG.warning('Could not figure out the allowed values for the '
                          'reset keys in secure boot %s', self.path)
              return set(mappings.SECUREBOOT_RESET_KEYS_MAP_REV)
  
          return set([mappings.SECUREBOOT_RESET_KEYS_MAP[v] for v in
                      set(mappings.SECUREBOOT_RESET_KEYS_MAP).
                      intersection(reset_keys_action.allowed_values)])