Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/34948

Log:
commit 76ca383da1f52687cd439c31ff1cc561a6e75dcc
Author: David Hadas <davidh at il.ibm.com>
Date:   Fri Jun 28 22:20:33 2013 +0300

    Controller Callbacks
    
    A callback mechanism was added to allow middleware to register
    callbacks from a/c/o controllers allowing easier core swift
    extendiability by middleware.
    
    The callback takes the form:
          resp = controller_callback(req, resp)
    
    Any middleware using the callback mechanism should chain
    its callback to previous callbacks - i.e. it is tasked to
    call any other callback it replaces when adding itself.
    
    DocImpact
    
    Bug: #1195861
    Change-Id: I7ef756cb7030e1189a0ba74da5b3cf689969b2c6

Automatically generated bug (please review):
https://bugs.launchpad.net/bugs/1195875