Upgrade cinder rootwrap config on upgrade

Upgrade cinder rootwrap config on havana to icehouse upgrade, so that it
switches to using oslo-rootwrap instead. This follows the model used by
Nova in previous upgrades.

Requires that configure_cinder_rootwrap() is available in devstack, so
https://review.openstack.org/#/c/65946 must land first.

Change-Id: Iccb262ac2005efdfb509edee7c967801d8fb0c65