needle::needles is basically <string, needle> wheras needle::tags is
<string, array<needle>>, seeing as we have overlapping names we need latter
rather than former as otherwise we'd only ever look at one of the needles

we should be introducing a policy to not have name overlap perhaps, this
may not be the only case where os-autoinst isn't properly dealing with
fullnames but instead relies on basenames (which may well overlap)