Add auth role to ansible

Add a auth role so ansible can deploy
keystone.

Change-Id: I3f41fe150654451aae6271cce59ddeb807945043

ansible/inventory/all-in-one

@@ -6,3 +6,6 @@ support
 
 [message-broker:children]
 support
+
+[keystone:children]
+support

ansible/roles/keystone/tasks/main.yml

+---
+- name: Bringing up keystone service(s)
+  docker_compose:
+    project_name: keystone
+    compose_file: "{{ koalla_directory }}/compose/keystone.yml"
+    command: up
+    no_recreate: true

ansible/site.yml

@@ -8,3 +8,8 @@
   roles:
     - message-broker
   tags: message-broker
+
+- hosts: keystone
+  roles:
+    - keystone
+  tags: keystone