Fix mariadb connection problem due to login_password

We do not need login password for mariadb.
So removed mariadb password for register.yml.

Change-Id: I92ada00a37e0c9fcc4ac5a5d344b1fd16f56ea2e
Closes-Bug: #1661965
Signed-off-by: Taeha Kim <kthguru@gmail.com>

ansible/roles/mariadb/tasks/register.yml

@@ -6,7 +6,6 @@
       login_host: "{{ api_interface_address }}"
       login_port: "{{ mariadb_port }}"
       login_user: "{{ database_user }}"
-      login_password: "{{ database_password }}"
       name: "haproxy"
       password: ""
       host: "%"