Ref T2231. Allows you to edit the remote URI and credentials.
This is a little bit funky because I'm reusing some of the pages on the new (not-yet-hooked-up) create form. Specifically, it had pages like this:
- Repo Type
- Name/Callsign/Remote
- Auth
- Done
I split "Name/Callsign/Remote" into "Name/Callsign" and "Remote", then when editing the remote I just take you through "Remote" and "Auth" and then back. This lets us reuse the giant pile of protocol/URI sanity checking logic and ends up being pretty clean, although it's a little weird that the "Create" controller does both full-create and edit-remote.