Fix delegate tasks for kubectl and etcdctl

roles/upgrade/pre-upgrade/tasks/main.yml

@@ -2,6 +2,7 @@
 - name: See if node is in ready state
   command: "kubectl get nodes | grep {{ inventory_hostname }}"
   register: kubectl_nodes
+  delegate_to: "{{ groups['kube-master'][0] }}"
   ignore_errors: true
 
 - set_fact: