[cinder] ussuri PTG schedule

The Ussuri PTG schedule is live: https://etherpad.openstack.org/p/shanghai-ptg-cinder Please check the schedule and let me know right away if your session causes a conflict for you. Except for the few fixed-time topics, we will follow the cinder tradition of dynamic scheduling, giving each topic exactly as much time as it needs and adjusting as we go. cheers, brian