Updated openstack/openstack
Project: openstack/python-keystoneclient  61322a3feeb943e5341fc25c6df957aec59463be
null
Allow passing auth plugin as a parameter

This further separates the concept of session and auth plugin so that
the session can be a completely standalone transport layer.

This is similar to how requests handles things. You can install an auth
plugin on the session object and then everything that works through the
session will be authenticated or you can specify the auth plugin per
request and only authenticate that request.

Change-Id: If4ed5af831cc35e259d9f963062261819f08a9d5