Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/19008

Log:
commit 7de98740b291b154692b22e7e9917a449e32a16c
Author: Yun Mao <yunmao at gmail.com>
Date:   Fri Jan 11 11:39:14 2013 -0500

    Implement ZooKeeper driver for ServiceGroup API.
    
    The ZooKeeper driver uses ephemeral nodes in ZooKeeper to keep
    track of node liveness in a service group. The Implementation is
    based on the evzookeeper library to combine zookeeper
    and eventlet.
    
    Part of blueprint zk-service-heartbeat
    
    DocImpact: new driver
    
    Change-Id: Ia20519de2b4964007f8b91ea5d56d1875510d40f