Updated openstack/openstack
Project: openstack/keystone  9d6e3d3608a26719a9a49901bbf004a19cc1f1a8

Convert explicit session get/begin to transaction context

Convert the explicit common.sql.get_session() and subsequent
session.begin() to the transaction context manager for Trust
SQL backend.

Change-Id: I52745118782301ef26452063628e16e92e8ee276