mariadb: update configuration location

roles/mariadb/tasks/main.yml

@@ -8,7 +8,7 @@
     creates: /var/lib/mysql/mysql
 
 - name: configure mariadb
-  template: src=server.cnf.j2 dest=/etc/mysql/my.cnf
+  template: src=server.cnf.j2 dest=/etc/my.cnf.d
   notify:
     - restart mariadb