Re: yum-pluginize our upgrade magic

[Chris Lumens <clumens redhat com>]

> 1) import rpm at the toplevel of the whiteout plugin please, no reason
> not to

Done.

> 2) Not convinced that exclude is the right place to hook for the remove
> stuff.  I'd be slightly inclined to do the preresolve slot instead

Either is fine with me.  I'm not really sure which is right so I just
looked through the list until I found one that looked good.

> Otherwise, looks fine to me

Great, so I suppose these things need to find a home, a package to live
in, and we need to make the changes to get repomd.xml to contain
references.

Also, is the format of the metadata files fine?

- Chris