Updated openstack/openstack
Project: openstack/keystone  cbb33d70d97410e0d4da60ffd7b5cff73b62aa0f

Refactor notifications

I'm replacing the implementation of notifications with the blinker
library. In order to do this properly I wanted to have a more defined
interface and less coupling in the tests. Test should be unaware of the
implementation of the thing they are testing so that the implementation
can be changed later.

Change-Id: Icdcbf77944187bc9b2b390420862f700baa179c9