Allow murano on a dedicated node in a HA setup

Without this the haproxy role doesn't have the facts it needs to
render it's template, resulting in the following error:

TASK: [haproxy | Copying over config(s)]
************************************** fatal: [control01] => {'msg':
"AnsibleUndefinedVariable: One or more undefined variables: 'dict
object' has no attribute u'ansible_eno1'", 'failed': True}

This is similar to the fix applied previously for other services in
I99b7dbebd5a6193e192ee258ddf576d18db90ed7.

Change-Id: Idb7fa8763cff64ad761c5b8a1a3bf92a27f4f501
Closes-Bug: 1524738

ansible/site.yml

@@ -19,6 +19,7 @@
     - rabbitmq
     - swift-proxy-server
     - heat-api
+    - murano-api
   roles:
     - { role: haproxy,
         tags: haproxy,