private void setPreShutdownCommand(SentinelConfig.Service.Builder serviceBuilder, Service service) {
        if (service.getPreShutdownCommand().isPresent()) {
            serviceBuilder.preShutdownCommand(service.getPreShutdownCommand().get());
        }
    }
Overrides parent method as this is named config-sentinel and not configsentinel all over Vespa
@return service type for config-sentinel
config-model/src/main/java/com/yahoo/vespa/model/ConfigSentinel.java