@Override
    public void getConfig(CuratorConfig.Builder builder) {
        if (getParent() instanceof ConfigserverCluster) return; // Produces its own config
        for (var container : containers) {
            builder.server(new CuratorConfig.Server.Builder().hostname(container.getHostResource().getHostname()));
        }
        builder.zookeeperLocalhostAffinity(zooKeeperLocalhostAffinity);
    }
Returns a config server config containing the right zone settings (and defaults for the rest).
This is useful to allow applications to find out in which zone they are running by having the Zone
object (which is constructed from this config) injected.
config-model/src/main/java/com/yahoo/vespa/model/container/ContainerCluster.java