Disable default redis service from APT

See merge request tildes-community/tildes-cf!11

ansible/roles/redis/tasks/main.yml

@@ -25,6 +25,13 @@
     cmd: update-rc.d redis-server remove
   when: is_docker
 
+- name: Stop redis-server service installed through APT (if any)
+  systemd_service:
+    name: redis-server
+    state: stopped
+    enabled: false
+  ignore_errors: true
+
 - name: Create group for redis user
   group:
     name: redis