container cannot be deleted

container cannot be deleted by the ui, the log looks like this:

```
Traceback (most recent call last):
  File "/root/workspace/openstack/horizon/openstack_dashboard/api/rest/utils.py", line 128, in _wrapped
    data = function(self, request, *args, **kw)
  File "/usr/lib/python2.7/site-packages/zun_ui/api/rest_api.py", line 117, in delete
    client.container_delete(request, id)
  File "/usr/lib/python2.7/site-packages/zun_ui/api/client.py", line 134, in container_delete
    return zunclient(request).containers.delete(id, force)
TypeError: delete() takes exactly 2 arguments (3 given)

```

I check the code of zunclient and zun-api, the `force` argument in `zun_ui/api/client.py` should change to a keyword argument.