Replace deprecated "auth_uri" by "www_authenticate_uri"
Replace deprecated "auth_uri" by "www_authenticate_uri"

According to [1], "auth_uri" has been deprecated.
This patch replace it by using "www_authenticate_uri" instead.

[1] https://review.openstack.org/#/c/508522

Change-Id: Ib644a96425f0582f3d06249828275e65b645ab23

openstack/rpm-packaging,openstack/rpm-packaging