Comment 4 for bug 1401501

Reviewed: https://review.openstack.org/148219
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=6681513fe247cd8c458f234b8514e2af25d8b0ff
Submitter: Jenkins
Branch: stable/juno

commit 6681513fe247cd8c458f234b8514e2af25d8b0ff
Author: Matthew Gilliard <email address hidden>
Date: Fri Jan 16 14:37:39 2015 +0000

    Force glance recheck for kernel/ramdisk on rebuild

    When doing a rebuild, clear the instance_info's kernel
    and ramdisk values, to force the deploy driver to check
    glance. This is necessary as those values may have changed
    without us knowing.

    closes-bug: #1401501
    (cherry picked from commit 2e06859425ca79fac054b577b54906e4f0f39b12)
    (includes bugfix and test for that commit, added in
      0556b5852c0a685e47862d945e35a4772c8ed267)

    Conflicts:
     ironic/conductor/manager.py

    Change-Id: I8d7831789d21d3a2dcafd614989cf1e53dbedd70