Comment 4 for bug 1400796

Seems like there are actually a few variants to this,

steve:keystone$ nova usage-list
Usage from 2014-11-18 to 2014-12-17:
+----------------------------------+---------+--------------+-----------+---------------+
| Tenant ID | Servers | RAM MB-Hours | CPU Hours | Disk GB-Hours |
+----------------------------------+---------+--------------+-----------+---------------+
| 7390ee47b3c642cf86ed2e0501cab352 | 1 | 384.43 | 0.75 | 0.75 |
| ebab58588b9046a699057a51ac43133f | 1 | 57.88 | 0.11 | 0.11 |
+----------------------------------+---------+--------------+-----------+---------------+

steve:keystone$ nova usage
Usage from 2014-11-18 to 2014-12-17:
+---------+--------------+-----------+---------------+
| Servers | RAM MB-Hours | CPU Hours | Disk GB-Hours |
+---------+--------------+-----------+---------------+
| 1 | 384.84 | 0.75 | 0.75 |
+---------+--------------+-----------+---------------+

steve:keystone$ nova usage --tenant ebab58588b9046a699057a51ac43133f
Usage from 2014-11-18 to 2014-12-17:
+---------+--------------+-----------+---------------+
| Servers | RAM MB-Hours | CPU Hours | Disk GB-Hours |
+---------+--------------+-----------+---------------+
| 1 | 60.23 | 0.12 | 0.12 |
+---------+--------------+-----------+---------------+

I vote we just implement 'nova usage' and have it default to the current auth project, or have a flag for a specific project Id, and another flag to list all projects (it takes priority over the specified one). This way we always have the project id in the returned data.

+1 on making this show command instead of list.