Comment 70 for bug 1560965

Reviewed: https://review.openstack.org/649027
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=0df60f4dba64e45486d9ef4ea5a24e0ee4f05355
Submitter: Zuul
Branch: stable/queens

commit 0df60f4dba64e45486d9ef4ea5a24e0ee4f05355
Author: Eric Desrochers <email address hidden>
Date: Wed Mar 20 14:56:02 2019 -0400

    Not implicitly set vol_device_name to vda

    Using a scsi decorated image with:
    hw_disk_bus='scsi'
    hw_scsi_model='virtio-scsi'

    This solve the case where an instance is
    launched with 'image' selected as boot
    source with a new volume. This will result
    in /dev/vda instead of /dev/sda as it
    should.

    Not specifying device name in
    setFinalSpecBootImageToVolume() leaves the
    decision to nova to determine it.

    Example:
    -------
    VM boot volume without scsi meta data decoration:
    Attached To
    0a0cd660-7ce3-4033-9983-2e1099edc5f0 on /dev/vda

    VM boot volume with scsi meta data decoration:
    Attached To
    91f50dbc-8bdf-4293-84ea-fc5df27b5ee4 on /dev/sda
    --------

    Note: This commit doesn't address cases for
    where instances are launched using existing
    volume and snapshot, this will involve more
    work to migrate the code from BDMv1 to BDMv2.

    Closes-Bug #1560965

    Change-Id: I9d114c2c2e6736a8f1a8092afa568f930b656f09
    (cherry picked from commit 79a4c3bd1aac1473f0d524d98c4cb96475cde498)