NLB still sending requests to node while shutting down

[casprou]

From the time the node goes down until it gets de-registered from the Load Balancer, it will still getting requests. Reducing the thresholds and retries before the LB considers the node as unavailable could improve things but still, at least a few second will be required for that and also this could cause other issues like de-registering nodes for the wrong reasons. Any suggestions?