fix #12: choose daemonset apiVersion based on server version

[greenhandatsjtu]

Current CDK Version

v0.1.10 (latest)

Environment

Here's my K8s version:

root@node1:/home/ubuntu# kubectl version --short                
Client Version: v1.20.2
Server Version: v1.20.2

Problem

#12

Steps to Reproduce the Problem

In a K8s cluster with server version >=v1.16, k8s-backdoor-daemonset script will fail:

/ # ./cdk run k8s-backdoor-daemonset anonymous alpine "echo helloworld; sleep 60000"
2021/04/08 10:47:13 getting K8s api-server API addr.
        Find K8s api-server in ENV: https://127.0.0.1:8080
2021/04/08 10:47:13 trying to deploy daemonset with image:alpine to k8s-app:kube-proxy
2021/04/08 10:47:13 api-server response:
{"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"the server could not find the requested resource","reason":"NotFound","details":{},"code":404}

Screenshots

Before

After

[Xyntax]

good job bro!