Code review comment for lp:~cjwatson/launchpad/init-branch-livefses

We talked about this in the LP team meeting a couple of weeks ago. We might want to copy "official" livefses (mostly those owned by ~ubuntu-cdimage) but not other ones, because that isn't the kind of change LP would normally apply to user-owned artifacts. The 30-day limit is too much of a hack.

If somebody wants to tackle this in future, the place to start would be by introducing a database-backed notion of whether livefses are official. For now it's not too bad to keep this client-side.