mariadb: adjust the setting of root password.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

roles/mariadb_server/tasks/main.yml

@@ -39,6 +39,9 @@
   no_log: True
   mysql_user: 
     name: root
+    login_user: root
+    login_password: "{{ mariadb_root_password }}"
+    user: root
     password: "{{ mariadb_root_password }}"
     login_unix_socket: /var/lib/mysql/mysql.sock
     check_implicit_admin: true