Marking kong instance as unready after kong quit

[mhkarimi1383]

We are using Kong behind an edge FW/LoadBalancer
And our Kong setup is running on K8s (DaemonSet with HostNetwork and NodeSelector)

Our Firewall checks for <node-ip>:8100/status/ready API every 5 Sec., So we could expect downtime for some secs with that setup (When we want to deploy new plugins by changing Docker image or changing some configs).

To remove that downtime I would suggest adding an option for marking Kong gateway instance as UnReady

So, kong quit --wait=15 will mark Kong gateway instance as UnReady while it's waiting (for 15 secs for example)

Or just adding a new status/admin API for marking node as UnReady