manipulate hosts only on request

roles/base/tasks/system_setup/hosts.yml

@@ -6,4 +6,5 @@
     owner: 'root'
     group: 'root'
   loop:
-    - { ip: '192.168.1.240', fqdn: 'gitlab.social.my-wan.de'}
+    - { ip: '192.168.1.240', fqdn: 'gitlab.social.my-wan.de'}
+  when: set_hosts is defined and set_hosts == true

roles/base/vars/main.yml

@@ -1,3 +1,4 @@
 rene_password:
 swappiness_value: 5
+set_hosts: false
 root_home: "{{ lookup('env','HOME') }}"