e2e-aws-ovn-serial fails because of OVNKubernetesControllerDisconnectedSouthboundDatabase

Description of problem:

OVNKubernetesControllerDisconnectedSouthboundDatabase alert seems to fire in the e2e-aws-ovn-serial CI job. Note that something funny happens in the job itself, which is that a set of ovnkube-node pods get created and then deleted and then get recreated again and test runs. But the alert gets fired for the first set of pods that got deleted. From the initial screening of artifacts alone its not clear what happened to the old pods. This needs investigation

Version-Release number of selected component (if applicable):

4.12 OCP

How reproducible:

Seems like always

Steps to Reproduce:

1.https://prow.ci.openshift.org/view/gs/origin-ci-test/pr-logs/pull/27043/pull-ci-openshift-origin-master-e2e-aws-ovn-serial/1568166237639282688
2. https://prow.ci.openshift.org/view/gs/origin-ci-test/pr-logs/pull/27043/pull-ci-openshift-origin-master-e2e-aws-ovn-serial/1567913444936519680

Actual results:

Alert is fired

Expected results:

Alert shouldn't be fired and this is expected in the serial job then we need to silence that alert for that job, make it flaky and not fail hard if that alert fires.

Additional info: