Fix some Ansible 'changed' conditions

roles/dns/tasks/main.yml

@@ -48,6 +48,7 @@
   file:
     path: "/etc/bind/named.conf.zones"
     state: touch
+  changed_when: false
   
 - name: Generate infrastructural zone
   template:

roles/mariadb/tasks/replication.yml

@@ -11,3 +11,5 @@
 
 - name: Setup MariaDB replication
   command: "/usr/sbin/mariadb-replicator --defaults-file={{ mariadb_config }} --master-host={{ mariadb_master_host }} --master-port={{ mariadb_master_port }} --replication-user={{ mariadb_replication_user }} --replication-password={{ mariadb_replication_password }} {{ '--master' if mariadb_is_master else '--slave' }}"
+  register: mariadb_replicator_result
+  changed_when: "mariadb_replicator_result.stdout != 'Nothing to do.'"