public function onClientCommandCreate(\Guzzle\Common\Event $event)
    {
        $command = $event['command'];
        if(get_class($command) != 'Guzzle\Openstack\Identity\Command\Authenticate'){
            if($event['client']->getToken() == null){
                throw new OpenstackException('Unauthenticated');
            }
        }
    }