Don't require a callsign to set a repository's local path
Summary: Ref T4245. When creating new repositories, set a default local path based on the repository ID instead of callsign.
- Created a new repository.
- Saw it get a reasonable, ID-based local path.
- Edited a repository to make sure the applyFinalEffects() wasn't doing anything whacky.
Reviewed By: chad
Maniphest Tasks: T4245
Differential Revision: https://secure.phabricator.com/D15303