R1:ca78c1825a66

When already running as the daemon user, don't "sudo" daemon commands

Summary:
The cluster synchronization code runs either actively (before returning a response to `git clone`, for example) or passively (routinely, as the daemons update reposiories).

The active sync runs as the web user (if running `git clone http://...`) or the VCS user (if running `git clone ssh://...`). But the passive sync runs as the daemon user.

All of these sync processes need to run actual commands as the daemon user (`git…