This commit reflects the split in the gnome-desktop group, as well as the desire of the Desktop team to have only certain games installed by default. This is part of: https://bugzilla.redhat.com/show_bug.cgi?id=846274
This commit reflects the split in the games group, keeping for each its default/optional status. This is part of: https://bugzilla.redhat.com/show_bug.cgi?id=846274