Description of problem:
sdn-controller is going through leader elections and restarting during the kube-apiserver rollout which currently takes around 60 seconds with shutdown-delay-duration and gracefulTerminationDuration is now set to 0 and 15 seconds ( https://github.com/openshift/cluster-kube-apiserver-operator/pull/1168 and https://github.com/openshift/library-go/pull/1104 ). sdn-controller leader election lease duration needs to be set to > 60 seconds to handle the downtime gracefully in SNO.

Recommended lease duration values to be considered for reference as noted in https://github.com/openshift/enhancements/pull/832/files#diff-2e28754e69aa417e5b6d89e99e42f05bfb6330800fa823753383db1d170fbc2fR183:

LeaseDuration=137s, RenewDealine=107s, RetryPeriod=26s.
These are the configurable values in k8s.io/client-go based leases and controller-runtime exposes them.
This gives us
   1. clock skew tolerance == 30s
   2. kube-apiserver downtime tolerance == 78s
   3. worst non-graceful lease reacquisition == 163s
   4. worst graceful lease reacquisition == 26s

Here is the trace of the events during the rollout: http://dell-r510-01.perf.lab.eng.rdu2.redhat.com/chaos/sno/sdn-controller/cerberus_api_rollout_trace.jsonWe can see that leader lease failures in the log: http://dell-r510-01.perf.lab.eng.rdu2.redhat.com/chaos/sno/sdn-controller/sdn-controller.log. The leader election can also be disabled given that there's no HA in SNO.



Version-Release number of selected component (if applicable):
4.8.0-0.nightly-2021-07-19-192457

How reproducible:
Always

Steps to Reproduce:
1. Install a SNO cluster using the latest nightly payload.
2. Trigger kube-apiserver rollout or outage which lasts for at least 60 seconds ( kube-apiserver rollout on a cluster built using payload with https://github.com/openshift/cluster-kube-apiserver-operator/pull/1168 should take ~60 seconds ) - $oc patch kubeapiserver/cluster --type merge -p '{"spec":{"forceRedeploymentReason":"ITERATIONX"}}' where X can be 1,2...n
3. Observe the state of sdn-controller.

Actual results:
sdn-controller goes through leader election and restarts.

Expected results:
sdn-controller should handle the API rollout/outage gracefully.

Additional info:
Logs including must-gather: http://dell-r510-01.perf.lab.eng.rdu2.redhat.com/chaos/sno/sdn-controller/