Add dns_domain for each host to /etc/hosts

Fixes #754

roles/kubernetes/preinstall/tasks/etchosts.yml

@@ -3,8 +3,7 @@
   blockinfile:
     dest: /etc/hosts
     block: |-
-      {% for item in groups['all'] -%}
-      {{ hostvars[item]['access_ip'] | default(hostvars[item]['ip'] | default(hostvars[item].ansible_default_ipv4.address)) }}{% if (item != hostvars[item]['ansible_hostname']) %} {{ hostvars[item]['ansible_hostname'] }}{% endif %} {{ item }}
+      {% for item in groups['all'] -%}{{ hostvars[item]['access_ip'] | default(hostvars[item]['ip'] | default(hostvars[item].ansible_default_ipv4.address)) }}{% if (item != hostvars[item]['ansible_hostname']) %} {{ hostvars[item]['ansible_hostname'] }} {{ hostvars[item]['ansible_hostname'] }}.{{ dns_domain }}{% endif %} {{ item }} {{ item }}.{{ dns_domain }}
       {% endfor %}
     state: present
     create: yes