Updated openstack/openstack
Project: openstack/nova  7b146a213bb66bde9f2b1d108e14842d6670ba2f

Switch default cinder API to V2

Cinder v1 is deprecated and using v1 emits a warning (introduced in
Id8abbbb4d9b0c8c49ab51fc3d958ef0d487467f8). So update the default value
to Cinder v2.

DocImpact

Closes-Bug: #1390131

Change-Id: Ica650962c9354d741b464ec152e9e1c6d0d5fa10