[BUG] yurtadm join fails with k8s version 1.19.4

[YTGhost]

What happened:

When we use k8s version v1.19.4, yurtadm join will fail

What you expected to happen:
yurtadm join has no exceptions and can join nodes smoothly

How to reproduce it (as minimally and precisely as possible):
When refactoring the yurtadm join, we constructed the JoinConfiguration file as the configuration file for calling kubeadm, which apiVersion is kubeadm.k8s.io/v1beta3. According to https://kubernetes.io/docs/reference/config-api/kubeadm-config.v1beta3/, v1beta3 is only supported for v1.22.x and above.

Anything else we need to know?:

Environment:

• OpenYurt version:
• Kubernetes version (use kubectl version):v1.19.4
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others:

others

/kind bug

[YTGhost]

@rambohe-ch I think we need to switch the apiVersion of the JoinConfiguration file to v1beta2 so that it supports v1.15.x and above, WDYT?
Another question is whether we still need to be compatible with k8s below v1.15.x. If so, perhaps we should dynamically switch the apiVersion used depending on the k8s version of the cluster.

[rambohe-ch]

@rambohe-ch I think we need to switch the apiVersion of the JoinConfiguration file to v1beta2 so that it supports v1.15.x and above, WDYT? Another question is whether we still need to be compatible with k8s below v1.15.x. If so, perhaps we should dynamically switch the apiVersion used depending on the k8s version of the cluster.

@YTGhost I think we only need to support K8s with versions larger than v1.18, and don't need to consider any smaller version.

maybe it's a good idea to switch the apiVersion of JoinConfiguration according to K8s version.

[YTGhost]

/assign