Correct master manifest cleanup logic (#1693)

Fixes #1666

roles/kubernetes/master/tasks/pre-upgrade.yml

@@ -17,14 +17,14 @@
   file:
     path: "/etc/kubernetes/manifests/{{item}}.manifest"
     state: absent
-  with_nested:
+  with_items:
     - ["kube-apiserver", "kube-controller-manager", "kube-scheduler"]
   register: kube_apiserver_manifest_replaced
   when: (secret_changed|default(false) or etcd_secret_changed|default(false))
 
 - name: "Pre-upgrade | Delete master containers forcefully"
   shell: "docker ps -f name=k8s-{{item}}* -q | xargs --no-run-if-empty docker rm -f"
-  with_nested:
+  with_items:
     - ["kube-apiserver", "kube-controller-manager", "kube-scheduler"]
   when: kube_apiserver_manifest_replaced.changed
   run_once: true