Resolve "deploy_demo deploys old version of stork"

Closes #686 (closed).

The problem was docker-compose up was run with default REGISTRY which you can see in docker-compose.yaml points to the public registry. Prior to the docker-compose up we are pushing the updated images to both the public registry and the private registry, and then we pull only from the private registry because we want the demo integrated with kea-premium. We never pull from the public registry. All recent invocations of deploy_demo were starting docker containers from images tagged with the public registry which might have been pulled manually at some point. This MR starts the right containers.