Bring back intersphinx reference to keystoneauth

Change-Id: I0b1d1a4abdf919dd403679565cde046a825898fa
Depends-On: I2a4fc6a4782a5496b2ab4a8355ed2c3b6dac58fa

doc/source/conf.py

@@ -227,8 +227,9 @@ latex_documents = [
 # If false, no module index is generated.
 #latex_use_modindex = True
 
-keystoneauth_url = 'https://docs.openstack.org/developer/keystoneauth/'
+keystoneauth_url = 'https://docs.openstack.org/keystoneauth/latest/'
 intersphinx_mapping = {
     'python': ('https://docs.python.org/', None),
     'osloconfig': ('https://docs.openstack.org/oslo.config/latest/', None),
+    'keystoneauth1': (keystoneauth_url, None),
 }