@Override
        public String toString() {
            StringBuilder buf = new StringBuilder();
            buf.append("[port=").append(port);
            buf.append(" serviceType=").append(serviceType);
            buf.append(" configId=").append(configId);
            buf.append(" suffix=").append(portSuffix);
            buf.append("]");
            return buf.toString();
        }
Models an immutable list of network port allocations

@author arnej
config-provisioning/src/main/java/com/yahoo/config/provision/NetworkPorts.java