Keystone v2 api's are removed in [1], so it's required
to use keystone v3 otherwise all requests fallbacks to
keystone v2.0 and fails.
[1] https://review.openstack.org/#/c/499783/
Change-Id: Ie2794d5fb12785e7c620c4ec8e3ccc2fb64d9e3b
Closes-Bug: #1723838