B&R: Error restoring k8s version in backup tarball

[Hugo Nicodemos Brito]

Brief Description
-----------------
The following error happens when the restore-platform playbook is run:
Cannot find BACKUP_TARBALL or the kube_cmd_versions table is missing in the backup tarball!

Severity
--------
<Minor: System/Feature is usable with minor issue>

Steps to Reproduce
------------------
Run restore-platform playbook

Expected Behavior
------------------
Restore process running normally

Actual Behavior
----------------
restore-platform breaks trying to get kube_cmd_versions

Reproducibility
---------------
<Reproducible>
100% reproducible

System Configuration
--------------------
<One node system, Two node system, Multi-node system, Dedicated storage, https, IPv4, IPv6 etc.>

Branch/Pull Time/Commit
-----------------------
Master

Workaround
----------
None

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/ansible-playbooks/+/848035

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/ansible-playbooks/+/848035
Committed: https://opendev.org/starlingx/ansible-playbooks/commit/ebd0c033d2bb9298be8dd4fa3d73cac88e5e7c2f
Submitter: "Zuul (22348)"
Branch: master

commit ebd0c033d2bb9298be8dd4fa3d73cac88e5e7c2f
Author: Hugo Brito <email address hidden>
Date: Tue Jun 28 20:10:06 2022 -0300

    B&R: Improve restore k8s versions

    The restore-platform tries to restore the k8s using
    zgrep into the backup tarball, but the kube_cmd_versions
    can be public.kube_cmd_versions. This improves
    the zgrep by adding regex.

    Test Plan:
    PASS: Perform platform backup and restore Debian
    PASS: Perform platform backup and restore CentOS

    Closes-bug: 1980158

    Signed-off-by: Hugo Brito <email address hidden>
    Change-Id: I3d64888d065da9c6a3c1d542f25fb8b2369b7e0f