[osp][octavia lb] LBs type svcs not updated until all the LBs are created

The Load Balancers for LB type svs are created sequentially, meaning that if 10 LB type
services are created in parallel and each LB takes 2 min to be created, the last LB
will be created after 20 min.

Even when any LB in OSP is in ACTIVE status, the svc is not updated with the FIP until
all the LBS are created.

4.12.0-0.nightly-2022-09-20-095559

Always

1. Deploy OCP
2. Create 10 LB type svcs:
 for i in `seq 1 10`;
 do echo $i;
 oc new-project test$i-ns;
 oc create deployment test$i-dep --image=quay.io/kuryr/demo;
 oc scale deployments/test$i-dep --replicas=2;
 oc expose deployment test$i-dep --name test$i-svc --type=LoadBalancer --port 80 --target-port=8080;
 done
3. Wait until the LBs are created 

LBs sequentially created

Should be created in parallel? not sure if this is the expected behavior but we should
consider it or analyze the impact/risks otherwise.