Updated openstack/openstack
Project: openstack/keystone  6aaba42f0d3038aa3f26b5f308dd45fcfef2a65a

Remove useless field passed into SQLAlchemy "distinct" statement

As only "actor_id" is queried from the database, so "target_id" wish to
passed into SQL statement is never got effective at all.

Change-Id: Icb3de96790439508c05cce81f95626404a30f7eb