Comment 4 for bug 1714147

Reviewed: https://review.openstack.org/499911
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=95f9751a6de6f9cfaf67a6301c2ef8f33ad75131
Submitter: Jenkins
Branch: stable/pike

commit 95f9751a6de6f9cfaf67a6301c2ef8f33ad75131
Author: Shivanand Tendulker <email address hidden>
Date: Fri Sep 1 02:34:48 2017 -0400

    Boot from volume fails with 'iscsi' deploy interface

    When boot from volume is requested for a node with 'iscsi' deploy
    interface and no 'image_source' is provided in
    'node.instance_info'. It calls boot.prepare_ramdisk() and fails
    while trying to perform validation for 'image_source'. This commit
    fixes the issue.

    Closes-Bug: #1714147
    (cherry picked from commit e9ecdbbadc6a5e2a0936830251ecd1d560bf017e)

    Change-Id: If8e51f4ed04cd7001bf68a8a6a4d2d2b40e43c62