Updated openstack/openstack
Project: openstack/keystone  a41f50706ba368e16d0db2e0ed7b864d016f088a
null
Move sql.Base.transaction

With the change to use oslo's db.sqlalchemy.sessions, the
sql.Base class isn't doing enough to justify its continued
existence.

This change is moving the transaction member out of Base.

Part of bp use-common-oslo-db-code

Change-Id: Ie0df7b397f8508e1c9be70ce9bbb2d733bde03ea