Comment 4 for bug 1444806

Reviewed: https://review.openstack.org/243028
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=aea87902180bebae93680e156a950f00a5f360fd
Submitter: Jenkins
Branch: stable/liberty

commit aea87902180bebae93680e156a950f00a5f360fd
Author: Jordan Pittier <email address hidden>
Date: Wed Jul 15 14:07:29 2015 +0200

    libvirt:on snapshot delete, use qemu-img to blockRebase if VM is stopped

    Libvirt won't do a blockRebase on a domain that is not running. So,
    in that case, use "qemu-img rebase" instead.

    Note: For now, trying to rebase a network disk using qemu-img raises
    a NovaException error because I can't test that it successfully works
    for every protocol (gluster, sheepdog, etc) that executes this code
    path. I successfully tested this with file-based disk.

    Change-Id: I0e6819a6c8dc70b9bd7d1a9c18dc185b4537a3e4
    Closes-Bug: #1444806
    Closes-Bug: #1465416
    (cherry picked from commit 1cf793df252756615dc01a105953346a8747e755)