public Fixture.Builder allowHostSharing(boolean allowHostSharing) {
            this.zone = new Zone(Cloud.builder()
                                      .dynamicProvisioning(zone.cloud().dynamicProvisioning())
                                      .allowHostSharing(allowHostSharing)
                                      .build(),
                                 zone.system(),
                                 zone.environment(),
                                 zone.region());
            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