conary update group-dist

Some changes I'd like to see.
When a file is in the way of an update, as it was the case, conary stops.
Maybe it should ask if the file should be changed by a new one, or keep the current file.

It made me a bit angry to move some files (/etc/issue, /etc/distro-release and /etc/issue.net) out of the way in order to do an update. And it made me more angry to see that it weren't extreme config files. :)