bugfix: undefined variables

some vars cannot be resolved in context
docker:client:stack:janitor_monkey:environment:simianarmy.client

Change-Id: I071dc9025983fc401083dc37e37b60be39077b27
diff --git a/docker/swarm/stack/janitor_monkey.yml b/docker/swarm/stack/janitor_monkey.yml
index 426a75c..95095e4 100644
--- a/docker/swarm/stack/janitor_monkey.yml
+++ b/docker/swarm/stack/janitor_monkey.yml
@@ -19,6 +19,9 @@
     janitor_monkey_openstack:
       project_domain_name: default
       project_name: admin
+      username: ""
+      password: ""
+      auth_url: ""
   docker:
     client:
       stack: