Deprecate auth_uri option

Option auth_uri from group keystone_authtoken is deprecated[1].
Use option www_authenticate_uri from group keystone_authtoken.

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

Change-Id: I43bbc8b8c986e54a9a0829a0631d78d4077306f8

doc/manpages/proxy-server.conf.5

@@ -299,7 +299,7 @@ for other examples.
 .PD 0
 .RS 10
 .IP "paste.filter_factory = keystonemiddleware.auth_token:filter_factory"
-.IP "auth_uri = http://keystonehost:5000"
+.IP "www_authenticate_uri = http://keystonehost:5000"
 .IP "auth_url = http://keystonehost:35357"
 .IP "auth_plugin = password"
 .IP "project_domain_id = default"

doc/source/install/controller-include.txt

@@ -55,7 +55,7 @@ following actions:
      [filter:authtoken]
      paste.filter_factory = keystonemiddleware.auth_token:filter_factory
      ...
-     auth_uri = http://controller:5000
+     www_authenticate_uri = http://controller:5000
      auth_url = http://controller:35357
      memcached_servers = controller:11211
      auth_type = password

doc/source/overview_auth.rst

@@ -138,7 +138,7 @@ add the configuration for the authtoken middleware::
 
   [filter:authtoken]
   paste.filter_factory = keystonemiddleware.auth_token:filter_factory
-  auth_uri = http://keystonehost:5000/
+  www_authenticate_uri = http://keystonehost:5000/
   auth_url = http://keystonehost:35357/
   auth_plugin = password
   project_domain_id = default
@@ -153,7 +153,7 @@ add the configuration for the authtoken middleware::
 The actual values for these variables will need to be set depending on
 your situation, but in short:
 
-* ``auth_uri`` should point to a Keystone service from which users may
+* ``www_authenticate_uri`` should point to a Keystone service from which users may
   retrieve tokens. This value is used in the `WWW-Authenticate` header that
   auth_token sends with any denial response.
 * ``auth_url`` points to the Keystone Admin service. This information is

etc/keymaster.conf-sample

@@ -52,7 +52,7 @@
 # project_id = changeme
 
 # The Keystone URL to authenticate to. The value of auth_endpoint may be
-# set according to the value of auth_uri in [filter:authtoken] in
+# set according to the value of www_authenticate_uri in [filter:authtoken] in
 # proxy-server.conf.
 # auth_endpoint = http://keystonehost/identity
 

etc/proxy-server.conf-sample

@@ -361,7 +361,7 @@ user_test5_tester5 = testing5 service
 #
 # [filter:authtoken]
 # paste.filter_factory = keystonemiddleware.auth_token:filter_factory
-# auth_uri = http://keystonehost:5000
+# www_authenticate_uri = http://keystonehost:5000
 # auth_url = http://keystonehost:35357
 # auth_plugin = password
 # The following credentials must match the Keystone credentials for the Swift