Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/16755

Log:
commit c0c87e117f8b94180994cf3f9e3a0d258ff82bf5
Author: Alvaro Lopez Garcia <aloga at ifca.unican.es>
Date:   Thu Nov 22 14:04:24 2012 +0100

    Added documentation for the external auth support
    
    This covers given authentication using REMOTE_USER and also the way to
    implement custom auth with WSGI middleware.
    
    DocImpact
    blueprint: pluggable-identity-authentication-handlers
    Change-Id: Idbac8c38d1f0be1febbbc8056c929bada6bbb07e