public static boolean isClusterController(ServiceCluster cluster) {
        return ServiceType.CLUSTER_CONTROLLER.equals(cluster.serviceType());
    }
@Test
    public void verifyNonControllerClusterIsNotRecognized() {
        ServiceCluster cluster = createServiceCluster(new ServiceType("foo"));
        assertFalse(VespaModelUtil.isClusterController(cluster));
    }