Comment 9 for bug 1643017

Reviewed: https://review.openstack.org/427290
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a2b886dcc81ba00949653a32a8f851d6e61e44a4
Submitter: Jenkins
Branch: stable/newton

commit a2b886dcc81ba00949653a32a8f851d6e61e44a4
Author: Lee Yarwood <email address hidden>
Date: Mon Nov 21 11:30:01 2016 +0000

    libvirt: Use the mirror element to detect job completion

    The mirror element was introduced in Libvirt 0.10.0 [1] and provides a
    ready attribute that helps to determine when a blockjob is complete.
    This is now used in addition to checking the progress of a given
    blockjob to ensure Nova waits until these jobs complete fully.

    [1] https://libvirt.org/git/?p=libvirt.git;a=commit;h=ae6aa8c3965e9aaa245b8e669c6324d44312ac1b

    Closes-bug: #1643017
    Change-Id: I0c52917a5555a70c4973f37dea1aebf878dd73b4
    (cherry picked from commit 9ed782641970dd371adc151e7d3913a402369dd3)