chore(rancher): setup an affinity rule for the redis slave too
chore(rancher): setup an affinity rule for the redis slave too

- use the dyn var mechanism instead of the hardcoded stack/service names

looztra/guestbook-api-server,looztra/guestbook-api-server,looztra/guestbook-api-server,looztra/guestbook-api-server,looztra/guestbook-api-server