check-builds should cross reference with charmhub

[freyes]

The check-builds command is capable of generating a report that includes the built charms per channel and per architecture. although the only source of data used is Launchpad, this information in general gives an accurate representation, but there may be situations where a charm was released manually, or re-released in a different channel (e.g. promoting a build from edge to candidate), hence check-builds should gather the information from charmhub and include it in the report, highlight charms that are inconsistent.