Code review comment for lp:~beuno/loggerhead/serve-config

I approve, pending the 403 vs. 404 bikeshed I started, but someone more knowledgeable than me should verify that you didn't miss any entry points.

Serving .bzr is broken -- see lp:~jelmer/loggerhead/fix-bzrserve or lp:~mnordhoff/loggerhead/380026-fix-serving-branches, but there are conflicts between them and this branch, and I'd prefer that you fix them. I could probably handle it myself, but it'd mostly be guesswork, trying random things until it stopped spewing 500 Internal Server Errors.