Use database_address and database_port var for mariadb check

This is how services reach mariadb; verify it that way.

Closes-Bug: #1823005
Change-Id: I9924ad050118b8a853e2309654a089f65178cd77

ansible/roles/mariadb/tasks/check.yml

 ---
 - name: Waiting for MariaDB service to be ready through VIP
-  command: "docker exec mariadb mysql -h {{ kolla_internal_fqdn }} -P {{ mariadb_port }} -u haproxy -e 'show databases;'"
+  command: "docker exec mariadb mysql -h {{ database_address }} -P {{ database_port }} -u haproxy -e 'show databases;'"
   register: result
   until: result is success
   changed_when: False