Replace auth_uri with www_authenticate_uri

The auth_uri option is deprecated in favor of www_authenticate_uri and
removed in the S release. We have done it before, but we missed
cyborg.conf.

TrivialFix

Change-Id: I630f69fd346e3291d3b8c6f6870af79e65211c85
(cherry picked from commit f3520bc)

Author: wchy1001

ansible/roles/cyborg/templates/cyborg.conf.j2

@@ -18,7 +18,7 @@ max_pool_size = {{ database_max_pool_size }}
 memcache_security_strategy = ENCRYPT
 memcache_secret_key = {{ memcache_secret_key }}
 memcache_servers = {% for host in groups['memcached'] %}{{ 'api' | kolla_address(host) | put_address_in_context('memcache') }}:{{ memcached_port }}{% if not loop.last %},{% endif %}{% endfor %}
-auth_uri = {{ keystone_internal_url }}
+www_authenticate_uri = {{ keystone_internal_url }}
 project_domain_name = {{ default_project_domain_name }}
 project_name = service
 user_domain_name = {{ default_user_domain_name }}