Comment 2 for bug 1749860

Reviewed: https://review.openstack.org/545186
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=8f2e487b2bd9168822268fcca1ab43ff93084afe
Submitter: Zuul
Branch: master

commit 8f2e487b2bd9168822268fcca1ab43ff93084afe
Author: Hironori Shiina <email address hidden>
Date: Fri Feb 16 10:03:19 2018 +0900

    Set 'initrd' to 'rescue_ramdisk' for rescue with iPXE

    The kernel paramter 'initrd' is hard-coded as 'deploy_ramdisk' in iPXE
    config template. A rescue ramdisk may fail to boot due to this wrong
    paramter. This patch sets this 'initrd' paramter properly to
    'deploy_ramdisk' or 'rescue_ramdisk' by adding a new pxe option.

    Change-Id: I8ad1223dc289bbe915ee4ca8db66c8f80bf08f15
    Closes-Bug: 1749860