docs: def activate_license(self, key):
          """Activates iLO license.
  
          :param key: iLO license key.
          :raises: IloError, on an error from iLO.
          """
          root = self._create_dynamic_xml('LICENSE', 'RIB_INFO', 'write')
          element = root.find('LOGIN/RIB_INFO/LICENSE')
          etree.SubElement(element, 'ACTIVATE', KEY=key)
          d = self._request_ilo(root)
          self._parse_output(d)