hack(kubeadm): add cleanup kubeadm script

hack/kubeadm/9.cleanup_kubeadm.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+
+# run kubeadm reset to kick off reset process
+kubeadm reset -f
+
+# stop kubelet and docker
+systemctl stop kubelet
+systemctl stop docker
+
+# remove orphant files
+rm -rf /var/lib/cni/
+rm -rf /var/lib/kubelet/*
+rm -rf /etc/cni/
+
+# stop network inferface
+ifconfig cni0 down
+ifconfig flannel.1 down
+ifconfig docker0 down
+
+# remove network interface
+ip link delete cni0
+ip link delete flannel.1
+
+# restart docker
+systemctl restart kubelet
+systemctl restart docker