Bugtool: add taskset

[youssefazrak]

To assist with additional debugging around processor affinity, we are
adding the Taskset command to the bugtool.

Fixes: #14566

Signed-off-by: Youssef Azrak yazrak.tech@gmail.com

[youssefazrak]

@joestringer
I added the -pc flag instead of the simple -pc as this gives back a more "user-friendly" result for the cpu affinity instead of the hexadecimal value.

Btw, numactl -H seems to give some useful information at a higher-level as it is aware of the processor topology and how the CPU cores map to CPU sockets.

[twpayne]

LGTM, thanks!

[joestringer]

numactl -H looks kinda interesting, if we were to add it we'd have to also extend the container image to include the tool.

Though that said I'm not sure it necessarily matters so much for general debugging. The reason I proposed taskset is because it observes state that Go uses to detect the number of CPUs and therefore could impact BPF map initialization and so on. Not sure whether the NUMA layout is likely to impact those kinds of things in such a way that it's important to retrospectively analyse rather than an active investigation into e.g. performance, queue configuration, etc.?

[joestringer]

PR LGTM, doesn't impact CI so merging.

[twpayne]

Marking this PR for backport, as it's another useful addition.