Updated openstack/openstack
Project: openstack/python-openstackclient  9137cc304d73aa60548fa255d2bf668600aa0ec4
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Do lookups for user, project in volume create

This required https://review.openstack.org/26323 in keystoneclient,
merged long ago...

Also adds some tests for 'volume create'

Change-Id: I55bededbc20b5dcf2833c59eb2b6b069703d8a9a