Make basic KNS updating (and installing multi-item entries) work
Prior to this, the only KNS entries which would be able to install correctly were entries with exactly one download item in them. This patch fixes this part of the issue.
BUG:424919
The second part of a fix, to ensure things work correctly, is to forward questions from KNS correctly, but this will require deeper intervention in Discover, to allow proceed requests to also offer options other than a yes/no style thing (specifically for this purpose, we need to be able to pick from a list of items).