Change locations of docs for intersphinx

Due to latest change in docs the old urls don't work and cause gate
failures. Fix it to reflect the new locations.

Change-Id: Ie5f1144b1a943c73337c1e076d2a9910a9342bd3

doc/source/conf.py

@@ -77,6 +77,6 @@ latex_documents = [
 
 intersphinx_mapping = {
     'python': ('https://docs.python.org/', None),
-    'osloconfig': ('http://docs.openstack.org/developer/oslo.config/', None),
+    'osloconfig': ('http://docs.openstack.org/oslo.config/latest/', None),
     'dogpilecache': ('https://dogpilecache.readthedocs.io/en/latest/', None),
 }