restart scheduler and controller-manager too

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

@@ -0,0 +1,3 @@
+drain_grace_period: 30
+drain_timeout: 40s
+

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

@@ -1,9 +1,9 @@
 ---
 - name: See if node is in ready state
-  command: "kubectl get nodes | grep {{ inventory_hostname }}"
+  shell: "kubectl get nodes | grep {{ inventory_hostname }}"
   register: kubectl_nodes
   delegate_to: "{{ groups['kube-master'][0] }}"
-  ignore_errors: true
+  failed_when: false
 
 - set_fact:
     needs_cordoning: >-