SDN healthcheck unable to reconnect to OVS server.

Issue

• Restarts of the networking processes (SDN, Proxy, DNS) result in multi-tenant SDN connectivity being lost when the new process comes up. The pods remain reachable while the old process is terminating, but creation results in the existing pods having no connectivity.
• Systemd unit files are configured so that if systemd restarts OVS (due to crash or upgrade process), then it will restart Openshift components too, so recover is possible as automatically. But if the deletion of the SDN is done manually, for example, as per following command ip link del br0, or as per any miss-configuration error, SDN will stay in an undesirable state until you restart Openshift node and its networking processes.