'Creates a new Volume.
For a full list of available parameters, please refer to the official
API reference:
http://developer.openstack.org/api-ref/block-storage/v1/#create-volume'

def create_volume(self, **kwargs):

    post_body = json.dumps({'volume': kwargs})
    (resp, body) = self.post('volumes', post_body)
    body = json.loads(body)
    self.expected_success(200, resp.status)
    return rest_client.ResponseBody(resp, body)
