Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/23820

Log:
commit c7f94c61153217d31e05f4c9b92282fc88bd566f
Author: Alvaro Lopez Garcia <aloga at ifca.unican.es>
Date:   Wed Mar 6 16:41:46 2013 +0100

    Improve authentication plugins management.
    
    The current auth plugin system lacks some functionality to be used with
    other methods that might require additional configuration options or
    that do not require a user to pass some options that are now compulsory
    (for example, X.509 authentication needs to get a certificate file, and
    does not need either a username or a password). This commit extends
    the current system to handle these extra features, while remaining
    compatible with older plugins.
    
    DocImpact: We should documment how to implement additional
    authentication plugins, such as BasicAuth, X509, etc.
    Implements: blueprint authentication-plugins
    
    Change-Id: I7b0ef4981efba8160dea94bf852dba7e2e4068f5