Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/28267

Log:
commit bade64524fc0516111e00d9d8e2144ab77c9fc1d
Author: Matthew Sherborne <msherborne at gmail.com>
Date:   Mon May 6 10:28:48 2013 +1000

    Add support for entrypoints virt drivers.
    
    Manage them via entry point loading. If the driver cannot be found via
    entrypoint, then fall back to old-style import mechanism in case someone
    else was relying on the old behavior.
    
    With this, things like "pip install nova-virt-hyper-v" could be expected
    to work.
    
    Resurrected from: https://review.openstack.org/#/c/11027
    Uses short names from: https://review.openstack.org/#/c/15030/1/setup.py
    
    The new shorter names for the libvirt drivers are shown in setup.cfg. A
    'deprecated' log will be shown if one tries to load a driver using its
    classname or full class path.
    
    When loading deprecated classes, we only care about the class name, not
    the path to it. This means that a single line in setup.cfg can handle up
    to 3 possible old settings.
    
    Part of blueprint entrypoints-plugins
    DocImpact
    
    Change-Id: Ia20ab01e2a9806b42acdfe040d678fce4b726c45