'tc' utility is missing from StarlingX since recent iproute updates

[M. Vefa Bicakci]

Since iproute has been updated with the following commits, tc has been missing from StarlingX ISO installations.

https://review.opendev.org/c/starlingx/integ/+/814682

https://review.opendev.org/c/starlingx/integ/+/815907

This bug is reported to re-add the tc utility to the StarlingX ISO.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/integ/+/819021

[Ghada Khalil (gkhalil)]

screening: stx.6.0 / high - tc utility is used for traffic shaping. issue introduced recently and should be fixed.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/integ/+/819021
Committed: https://opendev.org/starlingx/integ/commit/2421d5a3aa316b447a91eb14f55ed26739f8c2c8
Submitter: "Zuul (22348)"
Branch: master

commit 2421d5a3aa316b447a91eb14f55ed26739f8c2c8
Author: M. Vefa Bicakci <email address hidden>
Date: Tue Nov 23 11:02:49 2021 -0500

    Add iproute-tc to the ISO image

    iproute was updated from 4.11 to 5.12 with commit a7760b40a266
    ("iproute: Update from 4.11.0-14 to 5.9.0-4") and commit 36673774ee3c
    ("iproute-5.12, iptables-1.8.4, and libnftnl-1.1.5"). In CentOS 7, the
    iproute-4.11 RPM package included the 'tc' utility, but with CentOS 8,
    tc was moved to a separate RPM package, "iproute-tc".

    The original version of the second aforementioned commit added the
    iproute-tc RPM package in the ISO, but iproute-tc was later removed from
    the ISO during the code review, as it was not known at the time that tc
    had been split into a separate package (iproute-tc) between CentOS 7's
    iproute 4.11 and CentOS 8's 5.9/5.12, and that tc used to be included in
    the StarlingX ISO before the iproute updates.

    This commit explicitly adds the iproute-tc package into the ISO image to
    make tc available in StarlingX installations again.

    To prevent another similar issue, the iproute spec file was scanned for
    %package declarations to see if any other new sub-packages had been
    introduced since CentOS 7, and only the iproute-tc package was seen.

    Verification:
    - ISO build was successful.
    - Resulting bootimage.iso file was confirmed to contain the iproute-tc
      RPM package via "iso-info -f -i bootimage.iso | grep iproute-tc".
    - Note that run-time testing of the tc utility had been carried out in
      the past for eBPF testing by manually installing the iproute-tc RPM
      package to a running StarlingX installation.

    Closes-Bug: #1951989

    Signed-off-by: M. Vefa Bicakci <email address hidden>
    Change-Id: I8422f0aa872101e85502f1f3f0d3dc62ec19b8bb