Bug 1918442

Description of problem:

Kubernetes defines that Services without endpoints should be rejected, in order to implement that, OVN-Kubernetes create ACLs for those services to reject the traffic.

Openshift has a feature for applications, that allows idling the applications, it basically find the scalable resources (deployments, ...) and scales them down to 0. However, once traffic target the service is received, OVN-Kubernetes throws an event to notify the corresponding controller and unidle the application-

As a consequence of Bug 1918422, "empty-lb-events does not take effect for existing load-balancers", both options are mutually exclusive, so services in a cluster without endpoints only will be able to reject or to be idled, but not both.



Steps to Reproduce:
1. Create a Kubernetes cluster with and without the option
  --ovn-empty-lb-events
2. Create a service without endpoints
  kubectl create service clusterip noendpoints --tcp 80
3. Try to connect to the service
  curl noendpoints:80

The cluster with ovn-empty-lb-events set will create an event but never will reject services without endpoints

The cluster without the ovn-empty-lb-events set will reject the services without endpoints but will never create the unidling event