The [keystone_authtoken]/auth_uri middleware parameter has been causing
extreme confusion amongst operators and developers ever since the
keystonemiddleware started accepting keystoneauth plugin parameters
including auth_url. The two parameters look identical and yet have
completely different meanings and are both required. This patch
deprecates auth_uri and renames it to www_authenticate_uri, which more
accurately describes the WWW-Authenticate header it is configuring and
is dissimilar to any other keystone_authtoken middleware parameter. This
also renames the internal variable names for consistency with the config
option.
Change-Id: I0cf11da3d395749df28077427689fdafc8a6b981
Colleen Murphy