Comment 4 for bug 939557

This diablo code TODO appears to be the culprit. It was changed in essex. I will test in essex, but this bug might be considered for diablo backport.

    def _action_reboot(self, input_dict, req, id):
        if 'reboot' in input_dict and 'type' in input_dict['reboot']:
            valid_reboot_types = ['HARD', 'SOFT']
            reboot_type = input_dict['reboot']['type'].upper()
            if not valid_reboot_types.count(reboot_type):
                msg = _("Argument 'type' for reboot is not HARD or SOFT")
                LOG.exception(msg)
                raise exc.HTTPBadRequest(explanation=msg)
        else:
            msg = _("Missing argument 'type' for reboot")
            LOG.exception(msg)
            raise exc.HTTPBadRequest(explanation=msg)
        try:
            # TODO(gundlach): pass reboot_type, support soft reboot in
            # virt driver
            self.compute_api.reboot(req.environ['nova.context'], id)
        except Exception, e:
            LOG.exception(_("Error in reboot %s"), e)
            raise exc.HTTPUnprocessableEntity()
        return webob.Response(status_int=202)