auth_uri option has been depreacted in
favor of www_authenticate_uri from group
keystone_authtoken in puppet-keystone [0]
and keystonemiddleware [1].
This patch adds the new option keeping auth_uri
references in the templates until the replace
will be updated in all puppet packages.
[0] https://review.openstack.org/#/c/558344/
[1] https://review.openstack.org/#/c/508522/
Closes-Bug: #1761171
Change-Id: I804ec73b970844d245dbb0911710ec817359beb0