Updated openstack/openstack
Project: openstack/python-keystoneclient  8bc8275bf3b4b1fd644102963f2980d23b1bffc9
null
Ensure JSON headers in Auth Requests

The Content-Type header will be set automatically by the request call
however we should also ensure that we set the Accept header because our
auth plugins only work with JSON.

Change-Id: Ib3badd70f4fa32d400565c39a072db547d86037e