OpenShift LoadBalancer subnet-id has been modified in OpenStack cloudprovider configuration, but still the old subnet-id is in use

Issue

• In the process of moving the OpenStack provided LoadBalancer network to a different one (i.e. new separate VLAN), the creation of the OpenShift LoadBalancer fails with

    Type     Reason                      Age                From                Message
  ----     ------                      ----               ----                -------
  Normal   EnsuringLoadBalancer        14s (x3 over 30s)  service-controller  Ensuring load balancer
  Warning  CreatingLoadBalancerFailed  13s (x3 over 30s)  service-controller  Error creating load balancer (will retry): failed to ensure load balancer for service external-ip/egress-2: error creating loadbalancer a90736272104c11eaa457fa163ea6dd8: error creating loadbalancer {a90736272104c11eaa457fa163ea6dd8 Kubernetes external service a90736272104c11eaa457fa163ea6dd8 2c8f634b-a212-46ae-9399-3aac3270fe9b   <nil>  }: Expected HTTP response code [201 202] when accessing [POST http://openstack.example.com:9696/v2.0/lbaas/loadbalancers], but got 409 instead
  {"NeutronError": {"message": "Quota exceeded for resources: ['loadbalancer'].", "type": "OverQuota", "detail": ""}}