Improving yamllint configuration (#11389)

Signed-off-by: Bas Meijer <bas.meijer@enexis.nl>

roles/kubernetes/preinstall/tasks/0060-resolvconf.yml

@@ -19,7 +19,7 @@
     create: yes
     backup: "{{ not resolvconf_stat.stat.islnk }}"
     marker: "# Ansible entries {mark}"
-    mode: 0644
+    mode: "0644"
   notify: Preinstall | propagate resolvconf to k8s components
 
 - name: Remove search/domain/nameserver options before block
@@ -53,6 +53,6 @@
     dest: "{{ resolveconf_cloud_init_conf }}"
     src: resolvconf.j2
     owner: root
-    mode: 0644
+    mode: "0644"
   notify: Preinstall | update resolvconf for Flatcar Container Linux by Kinvolk
   when: ansible_os_family in ["Flatcar", "Flatcar Container Linux by Kinvolk"]