private static void warnIfInactivePort(Server server, int port) {
        for (ServerPort serverPort : server.activePorts().values()) {
            if (serverPort.localAddress().getPort() == port) {
                return;
            }
        }
        logger.warn("The specified port number {} does not exist. (expected one of activePorts: {})",
                    port, server.activePorts());
    }
Returns a newly-created {@link ConsulUpdatingListenerBuilder} with the specified {@code consulUri}
and {@code serviceName} to build {@link ConsulUpdatingListener}.

@param consulUri the URI of Consul API service
@param serviceName the service name which is registered into Consul.
consul/src/main/java/com/linecorp/armeria/server/consul/ConsulUpdatingListener.java