Clusters dashboard

Totally work in progress, but at least applies now (after lying dormant for 3 months). Not sure if it even works, to be confirmed... I also need to do a massive rebase to make sure it looks like I know what I'm doing. Use at your own risk.


Would there be any way to not hardcode this here? For instance, could we possibly use the fact that barclamps are members of "crowbar" (see `crowbar.yml`)?

The issue is that this is already missing some barclamps (like the updater one).