By default, the ::heat class configures clients_keystone/auth_uri to the
value of ::heat::keystone::authtoken::auth_url, which is generally the
admin endpoint on port 35357.
However, since this URI can be used by non-admin clients running inside
instances, such as os-collect-config, a better default value would be to
use either the public or internal Keystone endpoint, depending on the
deployment. This commit changes the default to the public Keystone
endpoint defined in ::heat::keystone::authtoken::www_authenticate_uri.
It is still possible to provide a custom value using the
heat_clients_keystone_uri parameter.
Change-Id: Idb0f408776ef27f16a522e4443531fd97276669b
Closes-Bug: #1763700
564b1a7234