Configure /etc/hosts as expected by Debian.

cf. https://www.debian.org/doc/manuals/debian-reference/ch05.en.html#_the_hostname_resolution

roles/common/tasks/main.yml

@@ -5,11 +5,20 @@
     hostname:
       name: "{{ inventory_hostname_short }}"
 
-  - name: Configure FQDN
+  - name: Configure localhots
     lineinfile:
       path: /etc/hosts
       regexp: '^127\.0\.0\.1'
-      line: "127.0.0.1 {{ inventory_hostname }} {{ inventory_hostname_short }} localhost"
+      line: "127.0.0.1 localhost"
+      owner: root
+      group: root
+      mode: 0644
+
+  - name: Configure FQDN
+    lineinfile:
+      path: /etc/hosts
+      regexp: '^127\.0\.1\.1'
+      line: "127.0.1.1 {{ inventory_hostname }} {{ inventory_hostname_short }}"
       owner: root
       group: root
       mode: 0644