Fix ansible syntax to avoid ansible warnings (one more) (#3536)

* warning on meta flush_handlers

* avoid rm

* avoid "Module remote_tmp /root/.ansible/tmp did not exist and was created with a mode of 0700, this may cause issues when running as another user. To avoid this, create the remote_tmp dir with the correct permissions manually" warning on subsequent tasks using blockinfile

* is match

roles/kubernetes/master/tasks/kubeadm-cleanup-old-certs.yml

@@ -1,3 +1,12 @@
 ---
+- name: kubeadm | Retrieve files to purge
+  find:
+    paths: "{{kube_cert_dir }}"
+    patterns: '*.pem'
+  register: files_to_purge_for_kubeadm
+
 - name: kubeadm | Purge old certs
-  command: "rm -f {{kube_cert_dir }}/*.pem"
+  file:
+    path: "{{ item.path }}"
+    state: absent
+  with_items: "{{ files_to_purge_for_kubeadm.files }}"