Comment 9 for bug 1743458

Reviewed: https://review.openstack.org/581398
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=0f253ea9c5f3f3d97bc049f00d1bcdf2761f0736
Submitter: Zuul
Branch: stable/queens

commit 0f253ea9c5f3f3d97bc049f00d1bcdf2761f0736
Author: Artom Lifshitz <email address hidden>
Date: Mon Jan 15 15:36:40 2018 -0500

    Refactor _build_device_metadata

    This patch splits out interface and disk metadata generation into its
    own function each, in preparation for handling hostdev metadata
    generation in a subsequent patch. It also adds some debug logging.

    NOTE(artom): Conflicts in nova/virt/libvirt/driver.py due to trusted
    VFs not being present in Queens.

    Related-bug: 1743458
    Change-Id: I318b9118c97d7bf2b61bc45698443e8d0255ff6f
    (cherry picked from commit d16d0d553b20fd45a83cf7c68bc477b97aece9a1)