Looking at novaclient, the names differ slightly. Could we follow nova's naming to make it intuitive for OpenStackers to use? Unless there is a good reason not to...

```
nova --help

...

  --os-auth-url <auth-url>
                        Defaults to env[OS_AUTH_URL].
  --os-region-name <region-name>
                        Defaults to env[OS_REGION_NAME
```