Cinder API was pinned to v1 due to openstackclient missing some of the
v2 commands, as reported in osc bug 1475060. That bug has since been
marked invalid, but its intent was covered by the blueprint:
https://blueprints.launchpad.net/python-openstackclient/+spec/volume-v2
This removes the pinning to the v1 API now that osc supports v2. Also
removing the enablement of v1 as it was deprecated three releases ago
and we would like to get more coverage on v2.
Change-Id: Ia4d97734738d026c8721791669110778ff5eb6e5
357dff588e