Updated openstack/openstack
Project: openstack/python-openstackclient  870e7ddbcce5d5f1b1bd36bb3ad95665565b3ced

Change volume create --volume-type to --type

This makes it consistent with the other --type options in OSC.  Also
add a few more volume_create tests.

Change-Id: I50ef927932cabf157ecdfd6c4faa1914b4fdf413