Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/17961

Log:
commit 889116d49082a75485ffa06b42223ba812b1f1a3
Author: Kravchenko Pavel <kpavel at il.ibm.com>
Date:   Sun Jan 6 11:27:05 2013 +0200

    Add to libvirt driver instance_on_disk method
    
    Added method to driver layer to validate that instance directory
    accessible from the host.
    
    part of libvirt driver support for blueprint rebuild-for-ha
    
    DocImpact
    
    Change-Id: I9c6a3aec99f61bd4fb6bc4b4264771e077aae96a
    Co-authored-by: Oshrit Feder <oshritf at il.ibm.com>