Parameterize most of the LAN config

So that it adapts to e.g. 192.168.50/24 instead of 192.168.0/24

roles/dns-dhcp-tftp/tasks/main.yml

@@ -42,7 +42,7 @@
     dest: "/etc/bind/{{ item }}"
   loop:
     - db.intern
-    - db.192.168.0
+    - db.lan
     - localzones
   notify: restart bind
 
@@ -53,7 +53,7 @@
     state: link
   loop:
     - db.intern
-    - db.192.168.0
+    - db.lan
   notify: restart bind
 
 - name: enable local bind config