[feature request]Remove k8s.io/kubernetes dependency for yurtctl

[rambohe-ch]

What would you like to be added:
Yurtctl have imported k8s.io/kubernetes, you can search k8s.io/kubernetes in pkg/yurtctl directory. and based on Issue #453, we need to remove k8s.io/kubernetes dependency.

Why is this needed:
From kubernetes introduction: https://github.com/kubernetes/kubernetes#to-start-using-k8s

To use Kubernetes code as a library in other applications, see the list of published components. Use of the k8s.io/kubernetes module or k8s.io/kubernetes/... packages as libraries is not supported.

others
/kind feature

[villanel]

/assign

[Peeknut]

yurtctl join, yurtctl init reuses a lot of code in kubeadm, and it takes a lot of work to delete dependencies directly and rewriting the code. How about download and use the kubeadm binary file directly in yurtctl?

[rambohe-ch]

it takes a lot of work to delete dependencies directly and rewriting the code. How about download and use the kubeadm binary file directly in yurtctl?

@Peeknut It's a good idea to use kubeadm binary directly. agree +1

[villanel]

There are two parts to be replaced here,kubelet and kubeadm, I will try to use the kubeadm binary file directly.

[rambohe-ch]

There are two parts to be replaced here,kubelet and kubeadm, I will try to use the kubeadm binary file directly.

@villanel Thank you for your reply. Do you have any progress of this enhancement?
and we want to solve this feature in these days, then we can go ahead to update OpenYurt other dependencies.

[villanel]

@rambohe-ch Thank you for your help, I will finish this part as soon as possible.

[villanel]

@rambohe-ch It seems kubeadm binary file has many test cases and unused code, should we keep these?

[rambohe-ch]

@rambohe-ch It seems kubeadm binary file has many test cases and unused code, should we keep these?

@villanel we can download kubeadm binary like download other components(eg: kubelet), and use the downloaded kubeadm binary by cmd.exec.