Change Repo URLs back to using UUID

[pgunn]

Right now, if you accidentally make two repos with the same name, the webconsole URL pattern does not serve you well as it uses the name of the repo in the URL. This can leave you without webconsole access to one or more of your repos.

(because of other reasons I need to debug I can't remove the extra repo locally ; DVID shuts down mid-API-call when I try to do so)