[BUG] pool-coordinator isn't rescheduled when its node disconnects from others

[AndyEWang]

What happened:
when the node disconnects from all nodes except itself, pool-coordinator in this node cannot be evicted.

What you expected to happen:
pool-coordinator should be rescheduled into a healthy node.

How to reproduce it (as minimally and precisely as possible):
just shutdown the node where pool-coordinator is located and the Pod of pool-coordinator won't be rescheduled.

Anything else we need to know?:
found that charts/openyurt/templates/pool-coordinator.yaml is configured with

            tolerations:
              - effect: NoExecute
                operator: Exists

Environment:

• OpenYurt version: 1.2
• Kubernetes version (use kubectl version): 1.22

/kind bug

[rambohe-ch]

@LaurenceLiZhixin @Congrool PTAL

[Congrool]

I think we can remove such toleration from pool-coordinator. Would you like to submit a pr? @AndyEWang

[AndyEWang]

@Congrool Ok, I will submit one if there is no special case to bind pool-coordinator to a node.