Allow the Kolla directory to be configurable

Implements the initial structure for variable substitution in ansible.

Change-Id: I26d82189273be6ebf941b0ab82efc6bf1eebc53d

ansible/README.md

@@ -25,6 +25,9 @@ to setup ssh-keys. More information on the ansible inventory file can be found
 Deploying
 ---------
 
+You can adjust variables for your environment in the file:
+"./kolla/ansible/group_vars/all.yml"
+
 For All-In-One deploys, you can run the following commands. These will setup all
 of the containers on your localhost.
 

ansible/group_vars/all.yml

@@ -0,0 +1 @@
+koalla_directory: "/usr/share/kolla"

ansible/roles/database/tasks/main.yml

@@ -2,6 +2,6 @@
 - name: Bringing up mariadb service(s)
   docker_compose:
     project_name: mariadb
-    compose_file: /usr/share/kolla/compose/mariadb.yml
+    compose_file: "{{ koalla_directory }}/compose/mariadb.yml"
     command: up
     no_recreate: true

ansible/roles/message-broker/tasks/main.yml

@@ -2,6 +2,6 @@
 - name: Bringing up rabbitmq service(s)
   docker_compose:
     project_name: rabbitmq
-    compose_file: /usr/share/kolla/compose/rabbitmq.yml
+    compose_file: "{{ koalla_directory }}/compose/rabbitmq.yml"
     command: up
     no_recreate: true