public LoadBalancerInstance withServiceIds(List<PrivateServiceId> serviceIds) {
        List<PrivateServiceId> ids = new ArrayList<>(serviceIds);
        for (PrivateServiceId id : this.serviceIds) if ( ! ids.contains(id)) ids.add(id);
        return new LoadBalancerInstance(hostname, ip4Address, ip6Address, dnsZone, ports, networks, reals, settings, ids, cloudAccount);
    }
Prepends the given service IDs, possibly changing the order of those we have in this.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/lb/LoadBalancerInstance.java