Add missing transport_url config

In oslo_messaging_notification section - vitrage conf,
kolla-ansible is missing transport_url.

Change-Id: I0100af9771dfdb9cd40ce5effff2a60c7bd43575

ansible/roles/vitrage/templates/vitrage.conf.j2

@@ -60,6 +60,7 @@ memcache_secret_key = {{ memcache_secret_key }}
 memcached_servers = {% for host in groups['memcached'] %}{{ hostvars[host]['ansible_' + hostvars[host]['api_interface']]['ipv4']['address'] }}:{{ memcached_port }}{% if not loop.last %},{% endif %}{% endfor %}
 
 [oslo_messaging_notifications]
+transport_url = {{ notify_transport_url }}
 topics = notifications,vitrage_notifications
 driver = messagingv2