Do not use ‘yes/no’ for boolean values (#11472)

Consistent boolean values in ansible playbooks

roles/kubernetes/preinstall/tasks/0063-networkmanager-dns.yml

@@ -6,7 +6,7 @@
     option: servers
     value: "{{ nameserverentries }}"
     mode: '0600'
-    backup: yes
+    backup: true
   when:
     - nameserverentries != "127.0.0.53" or systemd_resolved_enabled.rc != 0
   notify: Preinstall | update resolvconf for networkmanager
@@ -23,7 +23,7 @@
     option: searches
     value: "{{ (default_searchdomains | default([]) + searchdomains | default([])) | join(',') }}"
     mode: '0600'
-    backup: yes
+    backup: true
   notify: Preinstall | update resolvconf for networkmanager
 
 - name: NetworkManager | Add DNS options to NM configuration
@@ -33,5 +33,5 @@
     option: options
     value: "ndots:{{ ndots }},timeout:{{ dns_timeout | default('2') }},attempts:{{ dns_attempts | default('2') }}"
     mode: '0600'
-    backup: yes
+    backup: true
   notify: Preinstall | update resolvconf for networkmanager