Comment 1 for bug 1547675

As per our internal testing, the issue is introduced by cliff library version. If barbicanclient is using 1.16 or 1.17, then it happens. This has been fixed in 1.20 version (http://docs.openstack.org/developer/cliff/history.html#id1) which is released on 02/22/2016. It works fine with 1.15 version as well.

Looks like we need to exclude 1.16 and 1.17 version in global requirements in both stable/liberty and master branch to address it correctly.
master - https://github.com/openstack/requirements/blob/master/global-requirements.txt#L20.
stable/liberty - https://github.com/openstack/requirements/blob/stable/liberty/global-requirements.txt#L20