keystone_authtoken v3 options are missing

[Emilien Macchi]

When deploying Mistral with keystone_authtoken options for Keystone v3, Mistral API doesn't work.
It seems like some options are missing, and also some old options are still there and not replaced by the new ones.

I'm trying to add keystone v3 options in puppet-mistral:
https://review.openstack.org/#/c/461038/

But it fails to pass (for baremetal introspection workflow):
http://logs.openstack.org/38/461038/1/check-tripleo/gate-tripleo-ci-centos-7-ovb-nonha/6366d21/console.html#_2017-04-29_19_29_02_767553

It sounds like identity_uri is still required by Mistral while it's an old option that we shouldn't used, since it has been replaced by auth_url. When auth_url is used, Mistral fails to run the baremetal introspection workflow but succeed in some other tasks (basic API calls).

I'm not sure if Mistral fully support Keystone v3 at this point.