docker: fullRepoName always lowercase
docker: fullRepoName always lowercase

- Oddly, although these unit tests pass, the smoke test for
  this still fails. Something else is deciding on Docker repo
  name in the smoke tests and in real life.

samsalisbury/sous,samsalisbury/sous,opentable/sous,opentable/sous,samsalisbury/sous,samsalisbury/sous,opentable/sous,opentable/sous,samsalisbury/sous,opentable/sous