docs: def delete_vm(self, userid):
          """Delete z/VM userid for the instance."""
          LOG.info("Begin to delete vm %s", userid)
          self._smtclient.delete_vm(userid)
  
          # remove userid from smapi namelist
          self._smtclient.namelist_remove(self._namelist, userid)
          LOG.info("Complete delete vm %s", userid)