No Frozen Rawhide

[Roland McGrath]

> You actually want overlap for a while so that when rsyncing you can use
> hardlinks instead of having to redownload files you already have.
> This is going to be more relevant if koji signing happens and packages don't
> get different signatures depending on which repo they are in.

That would be nice for updates/updates-testing moves too.
For that, I've thought it might work to put them all in updates/.all or
someplace, with updates/... or updates/testing/... being hardlinks to that.