Allow session to return an error response object

[Openstack Gerrit]

https://review.openstack.org/83630

Dear documentation bug triager. This bug was created here because we did not know how to map the project name "openstack/python-keystoneclient" to a launchpad project name. This indicates that the notify_impact config needs tweaks. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit 4f1d25e4896a94f1a9760b309de7e86093da472a
Author: Jamie Lennox <email address hidden>
Date: Fri Mar 28 10:15:11 2014 +1000

    Allow session to return an error response object

    Typically we want to have exceptions thrown when dealing with requests
    that return an HTTP error. However when looking at integrating the
    session object with other clients it becomes apparent that the exception
    handling is sufficiently different that it is best for now to let the
    existing error handling work.

    Add an option to return the failed request rather than raise an
    exception so existing clients can do there own error handling.

    Blueprint: session-propagation
    DocImpact: New session parameter.
    Change-Id: I63ea034e7c6eaaf42d4329526a902677a8dd709d