[24.04/noble] Drop dsmark qdisc support

[Stefan Bader]

[SRU Justification]

== Impact

The kernel dropped support for the dsmark qdisc type in kernel 6.3. The iproute2 man pages and tc help still claim that to be supported and the DEP-8 selftest fails because of one of the sub-tests trying to use it.

== Fix

The 6.6.0 version of iproute2 drops support for dsmark with

From 11e6e783b63868e32d7145d82d1e4d4ccea6b920 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <email address hidden>
Date: Mon, 30 Oct 2023 11:35:32 -0700
Subject: [PATCH] tc: remove dsmark qdisc

Backport this change into noble to fix ADT testing and correct the claims of the user-space command. Later series are not affected as they carry version 6.14.0 of iproute2.

== Testcase

1. Check "man tc" and "tc qdisc help" to not mention dsmark.
2. ADT tests should pass.

== Regression potential

Scripts might complain about missing dsmark support but trying to use that type would have resulted in errors even before this change.