Improving yamllint configuration (#11389)

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

roles/kubernetes/node/tasks/kubelet.yml

@@ -12,7 +12,7 @@
     dest: "{{ kube_config_dir }}/kubelet.env"
     setype: "{{ (preinstall_selinux_state != 'disabled') | ternary('etc_t', omit) }}"
     backup: yes
-    mode: 0600
+    mode: "0600"
   notify: Node | restart kubelet
   tags:
     - kubelet
@@ -22,7 +22,7 @@
   template:
     src: "kubelet-config.{{ kubeletConfig_api_version }}.yaml.j2"
     dest: "{{ kube_config_dir }}/kubelet-config.yaml"
-    mode: 0600
+    mode: "0600"
   notify: Kubelet | restart kubelet
   tags:
     - kubelet
@@ -33,7 +33,7 @@
     src: "kubelet.service.j2"
     dest: "/etc/systemd/system/kubelet.service"
     backup: "yes"
-    mode: 0600
+    mode: "0600"
     validate: "sh -c '[ -f /usr/bin/systemd/system/factory-reset.target ] || exit 0 && systemd-analyze verify %s:kubelet.service'"
     # FIXME: check that systemd version >= 250 (factory-reset.target was introduced in that release)
     # Remove once we drop support for systemd < 250