mock and fc5/fe5 and comps pain

[seth vidal]

> Is this not a viable solution, then? Mock only needs the groups from the 
> (fairly stable) groups repo. We could set enablegroups=0 for all the 
> other repos and make sure that the comps in the groups repo is safe.
> 

safe in what regard? We still need to add a bunch of intelligence to
mock, then. It needs to know how to fetch it and parse it and that's
just one more file format to deal with.

I do agree with your point of having to build new packages if you change
the packages in your buildgroups but one nice thing you get from this is
sign-able buildgroup specification. b/c, right now, packages can be
signed, but the groups file cannot.

-sv