'List Tenant Usage For All Tenants.
For a full list of available parameters, please refer to the official
API reference:
https://developer.openstack.org/api-ref/compute/#list-tenant-usage-statistics-for-all-tenants'

def list_tenant_usages(self, **params):

    url = 'os-simple-tenant-usage'
    if params:
        url += ('?%s' % urllib.urlencode(params))
    (resp, body) = self.get(url)
    body = json.loads(body)
    self.validate_response(tenant_usages.list_tenant_usage, resp, body)
    return rest_client.ResponseBody(resp, body)
