Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/29464

Log:
commit c47b7ef0a78ccd6dc5d38283ee4d57da4a313ec7
Author: Michael Wilson <geekinutah at gmail.com>
Date:   Thu May 16 18:51:41 2013 -0600

    Add a slave db handle for the SQLAlchemy backend.
    
    Currently there are many read queries performed by the Openstack project which
    could be offloaded to clusters of replication slaves. Adding this handle
    let's projects utilize this capability. This patch adds two new configuration
    options: sql_slave_connection and sql_reads_to_slave.
    
    Implements: blueprint db-slave-handle
    DocImpact
    
    Change-Id: I5cc5e0696e3fcd8609ee6b5466b0377ca52b8b58