Unable to monitor a single project with nova

[ssbarnea]

It seems that this plugin fails to cover the use case where you only have access to a project, throwing this error:

failed to get stats :: You are not authorized to perform the requested action: admin_required

I think that this rules out most of the users because they would not be able to monitor resources usages inside their own project. Very few of them will have admin access over an entire cloud.