Dropping draining node while removing k8s cluster.

When executing kubectl drain node it sometimes removing
kuryr-controller first, which may happen, that deployments will hang
during removing, since the dependency on the controller.

Also, turns out, that we can simply skip it, and `kubeadm reset` will
remove everything for us, so that's enough.

Change-Id: I396fb8fa5658617d03f5fdeed93cc86aa61e4a2d

devstack/lib/kubernetes

@@ -176,10 +176,6 @@ function get_k8s_token {
 }
 
 function kubeadm_reset {
-    local nodename
-    nodename=$(kubectl get nodes -o jsonpath="{.items[0].metadata.name}")
-    kubectl drain $nodename --delete-emptydir-data --force --ignore-daemonsets
-    kubectl delete node $nodename
     sudo kubeadm reset -f
     sudo iptables -F
     sudo iptables -t nat -F

devstack/plugin.sh

@@ -155,13 +155,10 @@ if is_service_enabled kuryr-kubernetes kuryr-daemon \
     if [[ "$1" == "unstack" ]]; then
         # Shut down kuryr and kubernetes services
         if is_service_enabled kuryr-kubernetes; then
-            if [ "${KURYR_CONT}" == "True" ]; then
-                kubectl delete deployment kuryr-controller
-            else
+            if [ "${KURYR_CONT}" == "False" ]; then
                 stop_process kuryr-kubernetes
                 stop_process kuryr-daemon
             fi
-            #sudo systemctl stop kubelet
             kubeadm_reset
         fi
         cleanup_kuryr_devstack_iptables