[packagekit] exclude some upgrades

[Richard Hughes]

On Mon, 2007-11-12 at 15:28 -0500, David Zeuthen wrote:
> [1] : Sorry, I haven't studied the interfaces in detail so I'm making
> this up. It may be just be noise.

Nahh, much easier would be to just return Packages() with different
types. At the moment we return stuff like:

package security foo;
package normal foo;
package low foo;

So maybe we just have:

package cant foo;

Richard.