public Fixture.Builder awsZone(boolean allowHostSharing, Environment environment) {
            return zone(new Zone(Cloud.builder().dynamicProvisioning(true)
                                       .allowHostSharing(allowHostSharing)
                                       .build(),
                                  SystemName.Public,
                                  environment,
                                  RegionName.from("aws-eu-west-1a")));
        }
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