public void addNetworkPorts(NetworkPorts ports) {
        this.networkPortsList = Optional.of(ports);
        this.portFinder = new PortFinder(ports.allocations());
    }
Add port allocation from previous deployments.
Call this before starting port allocations, to re-use existing ports where possible
config-model/src/main/java/com/yahoo/vespa/model/HostPorts.java