Updated openstack/openstack
Project: openstack/keystone  5c155d622c0dc3f32ae10f06b67eb530de0a3cd1

Move base64 unit tests to keystone/tests/unit dir

Move the unit tests for test_base64utils.py to keystone/tests/unit since
they are unit tests.

Change-Id: I2b68422fd3f46f9dc13ac68d96b94502765ef8a4