Pass in keystone version and correct v2 URL to CLI
Pass in keystone version and correct v2 URL to CLI

CLI tests for auth v2 were using the wrong URL, should be
CONF.identity.uri and not CONF.identity.auth_uri.  Also the
CLI requires the keystone version to be pass in (ie "3.0" for
keystone v3).

Change-Id: I7fd3994022bf4f4575cbffb75f48042d889792a9

akash1808/python-barbicanclient,akash1808/python-barbicanclient,openstack/python-barbicanclient