Add interfaces to aggregate panel if they have GA- in SID

Add multiprocessing for generating dashboards to reduce provisioning time

when processing data from the inventory_provider poller/interfaces endpoint BDM now uses dashboards_info rather than dashboard_info
dashboards_info contains a list of objects rather than dashboard_info which contains a single object

potentially other fields too, although it's not immediately clear if this would be useful

Most fields need the conversion, so make it explicit when not required