Remove the keepalived tag in ansible

Keepalived container runs with the haproxy container.

Change-Id: I435a8850eca36ccfa5531b43ee7b5f1b72ecc880
Closes-Bug: #1497337

ansible/site.yml

 ---
 - hosts: [haproxy, mariadb, rabbitmq, cinder-api, glance-api, keystone, nova-api, neutron-server, swift-proxy-server]
   roles:
-    - { role: haproxy, tags: haproxy, keepalived, when: enable_haproxy | bool }
+    - { role: haproxy, tags: haproxy, when: enable_haproxy | bool }
 
 - hosts: mariadb
   roles: