docs: def _undedicate_device(self, userid, vaddr):
          """undedicate device."""
          action = 'undedicate'
          rd = ('changevm %(uid)s %(act)s %(va)s' %
                {'uid': userid, 'act': action,
                 'va': vaddr})
          action = "undedicate device from userid '%s'" % userid
          with zvmutils.log_and_reraise_smt_request_failed(action):
              self._request(rd)