[K8s] bash kubectl 자동완성

편의 기능

# ubuntu
sudo apt install bash-completion

# centos
sudo yum install -y bash-completion


# 공통
echo "source <(kubectl completion bash)" >> ~/.bashrc
echo 'alias k=kubectl' >>~/.bashrc
echo 'complete -o default -F __start_kubectl k' >>~/.bashrc
source ~/.bashrc