Edgeadm reset 遗留问题清理

[dodiadodia]

What happened: Edgeadm reset 后，还遗留一些信息需要清理：

1. iptables 规则：iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X
2. kubelet 未清理，包括 kubelet 二进制以及 systemd 文件，以及/var/lib/kubelet
3. cni未清理，包括/etc/cni/和/var/lib/cni/
4. 几个虚拟 ip 未清理，包括tkeedgedns，flannel.1，cni0

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• SuperEdge version:
• Kubernetes version (use kubectl version):
• OS (e.g. cat /etc/os-release):
• Kernel (e.g. uname -a):
• Hardware configuration (e.g. lscpu)
• Go Version (e.g. go version)
• Others: