Updated openstack/openstack
Project: openstack/keystone  6db884c4e39c8819a0286bb07b5883b271cf0110

Reduces the amount of mocked imports for Python 3

The evolution of the code as well as the Python 3 fixes has made some of
the module mocking unnecessary.

bp python3

Change-Id: I57e535012d89ee307acd43724dd678263704596f