NodePool Spec Labels is gone

[AndyEWang]

What happened:
To add labels in NodePool Spec in api version v1beta1 but nothing is set.

What you expected to happen:
spec.labels is expected in NodePool.

How to reproduce it (as minimally and precisely as possible):

1. deploy yurt-app-manager v0.6.0
2. create a nodepool with spec.labels in api version v1beta1
3. kubectl get nodepool -o yaml

Anything else we need to know?:
suspect that pkg/yurtappmanager/apis/apps/v1beta1/nodepool_conversion.go leads to this. No labels field is converted between v1alpha1 and v1beta1.

	dst.Spec.Selector = src.Spec.Selector
	dst.Spec.Annotations = src.Spec.Annotations
	dst.Spec.Taints = src.Spec.Taints

Environment:

• OpenYurt version: yurt-app-manager v0.6.0
• Kubernetes version (use kubectl version): 1.22

others

/kind bug

[rambohe-ch]

@kadisi PTAL