private ClusterApiImpl makeConfigClusterApi(int clusterSize, ServiceStatus first, ServiceStatus... rest)
            throws HostStateChangeDeniedException {
        return makeConfigClusterApi(clusterSize, new ConfigServerApplication(), first, rest);
    }
Make a ClusterApiImpl for the cfg1 config server, with cfg3 missing from the cluster (not provisioned).
orchestrator/src/test/java/com/yahoo/vespa/orchestrator/model/ClusterApiImplTest.java