Open Stack

Hi, I'd like you to take a look at this patch for potential
SecurityImpact.
https://review.openstack.org/197372

Log:
commit 6ca3951454945bdd31b1e4c58a427a40b7e63c5f
Author: Ian Cordasco <ian.cordasco at rackspace.com>
Date:   Tue Jun 30 18:32:13 2015 -0500

    Change default digest_algorithm value to sha256
    
    In I9236cc85f4e9881ac1aa35d69bc6761a59c1b6c8 it was promised that the
    default for digest_algorithm would change from sha1 to sha256. The sole
    purpose of this commit is to upgrade the default to sha256 as promised.
    
    DocImpact
    SecurityImpact
    Change-Id: I12be91db7b86e335a84c9ebed86dac3ba09051cb