Horizon Use Cinder V2 as Preferred Version

Current Horizon cinder API supports cinderclient v1 and cinderclient v2. However cinderclient v1 is by default the preferred version.

In order to see the features which are implemented in Horizon and only supported in cinderclient v2, user need to change settings files local_settings.py to uncomment the following :

OPENSTACK_API_VERSIONS = {
    #"identity": 3,
   "volume": 2
}

cinderclient v2 is backwards compatible, propose to set the Horizon cinder API to use cinderclient v2 by default.

VERSIONS = base.APIVersionManager("volume", preferred_version=2)

By the way nova project is moving to use cinderclient v2 as default.
https://blueprints.launchpad.net/nova/+spec/support-cinderclient-v2

Note: changes are simple, however testing should be thoroughly performed.