Setting kubectl bin directory (#1635)

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

 ---
 - name: See if node is in ready state
-  shell: "kubectl get nodes | grep {{ inventory_hostname }}"
+  shell: "{{ bin_dir }}/kubectl get nodes | grep {{ inventory_hostname }}"
   register: kubectl_nodes
   delegate_to: "{{ groups['kube-master'][0] }}"
   failed_when: false