Comment 1 for bug 1499540

The reason is that the client try to check whether the action is authentication required everytime.

But now, every action is authentication required according to:
https://github.com/openstack/python-glanceclient/blob/master/glanceclient/common/utils.py#L254
because every action doesn't have skip_authentication decorator. So I think we should have a discuess about:

1. Is it still need to check authentication required once user supply token and url?
2. If no, this only need a bug to fix.
2. If yes, which kind of action need to be check, and which not? We should add skip_authentication decorator to those who doesn't need check. In this case , I think we need a bp.