tools: Remove --os-identity-api-version, --os-volume-api-version opts

There is only one volume API and one identity API, and their collective
number is 3.

Change-Id: Ie269817c5bb0eddd8cfcf279a46cffe4a56377b2
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Depends-on: https://review.opendev.org/c/openstack/openstacksdk/+/942898
1 file changed