Comment 2 for bug 1981762

Reviewed: https://review.opendev.org/c/starlingx/config/+/849899
Committed: https://opendev.org/starlingx/config/commit/705077ed56e778685fcada8598c3c5d4592a38a3
Submitter: "Zuul (22348)"
Branch: master

commit 705077ed56e778685fcada8598c3c5d4592a38a3
Author: Iago Estrela <email address hidden>
Date: Thu Jul 14 18:25:20 2022 -0300

    Nohz_full configuration hieradata needs to be updated

    The grub commandline parameters contains nohz_full grub which needs
    to be updated with something different than a cpu list for kernel
    isolation when the user decides to disable it by assigning the
    disable-nohz-full label. In this manner, the disabled string can be
    used to signal the kernel to restore this configuration to default.

    Closes-Bug: 1981762

    Test plan:
    PASS: Disable nohz_full configuration in a standard worker by enabling
          disable-nohz-full label.
    PASS: Verify that /etc/default/grub doesn't contains nohz_full
    parameter.
    PASS: Verify that /sys/devices/system/cpu/nohz_full was restored to
          default.
    PASS: Enable nohz_full configuration in a standard worker by removing
          disable-nohz-full label.
    PASS: Verify that /sys/devices/system/cpu/nohz_full has the cpulist.
    PASS: Remove label and verify alarms and system overall health.
    PASS: Add label and verify alarms and system overall health.

    Signed-off-by: Iago Estrela <email address hidden>
    Change-Id: I00b68faae2612088b8e2fe7aeb3900babe638ca0