Open Stack

I just now upgraded my test install (nova, keystone and glance) from 
Liberty to Mitaka.  Immediately after the upgrade, every compute query 
in the openstack client or Horizon started returned a 404.

I resolved this problem by changing all of my nova endpoints in Keystone 
that looked like this:

    http://labtestnet2001.codfw.wmnet:8774/v2/$(tenant_id)s

so that they now look like this:

    http://labtestnet2001.codfw.wmnet:8774/v2

I can't find any online documentation to support this change. Every 
how-to guide includes the $(tenant_id)s component of the endpoint for 
nova, although other services (e.g. glance) seem not to recommend it.  
Can anyone help me understand what's going on here?  Are the docs just 
out of date, or do I have some subtle breakage in my install that this 
is revealing?

Thanks!

-Andrew