Description of problem:
Our chargeback reports need an overhaul in order to become more user friendly. Users can apply chargeback rates to OpenStack tenants; however, there is no way in the chargeback reports to get a single report grouped by OpenStack tenants. That's it. As simple as that sounds, one has to rely on tags and different contortions just to get the grouping--and then the data doesn't show up.

PLEASE IMPROVE THIS CRITICAL FEATURE IN CLOUDFORMS.


Version-Release number of selected component (if applicable):
All

How reproducible:
100% 

Steps to Reproduce:
1. Assign rates to OpenStack tenants
2. Create a chargeback report and try to group by OpenStack tenant
3. ...and realize it's not possible

Actual results:
Currently the chargeback report allows users to create a single report for one tenant. Well, if I have hundred of tenants that means I have to create a hundred reports, then aggregate, and the story just crumbles from there


Expected results:


Additional info:
We have multiple customers requesting this feature.