Comment 4 for bug 1961424

Reviewed: https://review.opendev.org/c/starlingx/metal/+/829944
Committed: https://opendev.org/starlingx/metal/commit/46f41901d65429e1d13410276f530e82cd63033c
Submitter: "Zuul (22348)"
Branch: master

commit 46f41901d65429e1d13410276f530e82cd63033c
Author: Bin Qian <email address hidden>
Date: Thu Feb 10 10:26:48 2022 -0500

    Do not install N+1 release unless upgrade in progress

    During upgrade, installer RPMs from release N need to be installed
    to host (release N+1).
    During downgrade, installer RPMs from release N+1 don't need to be
    installed to host (release N)
    Currently installer from "the other release" is installed to host
    regardless an upgrade is in progress or no by kickstarts. This
    requires the kickstarts on release N to understand the structure of
    installer RPM of future release. The installer from "the other
    release" only useful is when an upgrade is in progress (to provide
    installer when downgrade is required).

    This change removes the step to install RPMs from other release to
    host when upgrade is not in progress.

    TCs:
        Upgrade from 21.05 -> 21.12 abort after controller-1
            upgrade completed
        Upgrade from 21.05 -> 21.12
        Upgrade from 21.12 -> 22.02 abort after controller-1
            upgrade completed
        Upgrade from 21.12 -> 22.02
        load delete after 21.05 -> 21.12 upgrade abort
        load delete after 21.05 -> 21.12 upgrade complete
        load delete after 21.12 -> 22.02 upgrade abort
        load delete after 21.12 -> 22.02 upgrade complete

    Depends-on: https://review.opendev.org/c/starlingx/config/+/829943
    Closes-bug: 1961424

    Change-Id: I86edbe09410d3df9b9440d89208af90f0eb1fd09
    Signed-off-by: Bin Qian <email address hidden>