public Fixture.Builder clusterType(ClusterSpec.Type type) {
            cluster = ClusterSpec.request(type, cluster.id()).vespaVersion(cluster.vespaVersion()).build();
            return this;
        }
Set to true to allow multiple nodes be provisioned on the same host.
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Fixture.java