Improving yamllint configuration (#11389)

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

roles/kubernetes/preinstall/tasks/0100-dhclient-hooks.yml

@@ -11,7 +11,7 @@
     insertbefore: BOF
     backup: yes
     marker: "# Ansible entries {mark}"
-    mode: 0644
+    mode: "0644"
   notify: Preinstall | propagate resolvconf to k8s components
 
 - name: Configure dhclient hooks for resolv.conf (non-RH)
@@ -19,7 +19,7 @@
     src: dhclient_dnsupdate.sh.j2
     dest: "{{ dhclienthookfile }}"
     owner: root
-    mode: 0755
+    mode: "0755"
   notify: Preinstall | propagate resolvconf to k8s components
   when: ansible_os_family not in [ "RedHat", "Suse" ]
 
@@ -28,6 +28,6 @@
     src: dhclient_dnsupdate_rh.sh.j2
     dest: "{{ dhclienthookfile }}"
     owner: root
-    mode: 0755
+    mode: "0755"
   notify: Preinstall | propagate resolvconf to k8s components
   when: ansible_os_family == "RedHat"