fix redis role. It was previously trying to set up four containers in each of the redis machines.

ansible/roles/redis/tasks/main.yml

@@ -1,13 +1,8 @@
 ---
-- name: Start {{ item }} docker container
+- name: Start redis docker containers
   become: yes
-  with_items:
-    - "db-redis-user"
-    - "db-redis-story"
-    - "db-redis-sessions"
-    - "db-redis-pubsub"
   docker_container:
-    name: "{{ item }}"
+    name: redis
     image: redis:3.2.6
     state: started
     ports: