Create /etc/gai.conf if not exists when disable_ipv6_dns is 'true' (#6258)

roles/kubernetes/preinstall/tasks/0080-system-configurations.yml

@@ -25,6 +25,7 @@
     dest: /etc/gai.conf
     line: "precedence ::ffff:0:0/96  100"
     state: present
+    create: yes
     backup: yes
   when:
     - disable_ipv6_dns