ubuntu-support-status: emit source of packages

[Nish Aravamudan]

It would be really helpful if we could see the source of packages (e.g, for 3rd party repositories).

10:01 < xnox> nacc, the distinction of source of instalation, would be nice.
              cause e.g. google-chrome package installed form dl.google.com
              repository is clearly supported .... (by Google)

10:05 < TJ-> There's a relatively simple change to the tool which could clarify
             things enormounsly. When using --show-unsupprted and lumping all
             Ubuntu and 3rd party packages in one list, separate those out with
             different headers so instead of "Unsupported:" there is
             "Unsupported (Ubuntu universe/multiverse):" and "Unsupported
             (Third party installs):"

[Marc Deslauriers (mdeslaur)]

For third-party installs, we probably don't have the support status information, so we probably should say something like "Support unknown (Third party package)" or something similar.