add "k" as alias for "kubectl"

[noama-nv]

What would you like to be added:

https://github.com/kubernetes-sigs/kubespray/blob/master/roles/kubernetes/control-plane/tasks/main.yml#L44

add following line in "/etc/bash_completion.d/kubectl.sh"

alias k=kubectl
complete -F __start_kubectl k

Why is this needed:
interacting with Kubernetes cluster is much easier with "k" instead of "kubectl"

[floryut]

If you want to create a PR for that I guess we won't be against it (at least I'm not either for nor against) 😉

[0ekk]

That's not bad. And it is better to using a option to make it changeable. I'll work for it.