cpuset: make sure the cgroups driver combos cgroupfs+cgroupsv2 and docker+cgroups1 work

[shoenig]

#18371 is a major refactoring of how Nomad manages cgroups. There are many combinations of platforms and drivers and configurations of docker, etc. The mainstream Linux distros should already work as of that PR, but this issue is a reminder to go back and ensure the less common combinations also still work. In particular systems configured with

1. cgroupsv2 + docker using cgroupsfs cgroups driver
2. cgroupsv1 + docker using docker cgroups driver

exist in the wild but not out of the box.

[shoenig]

Tested by configuring /etc/docker/daemon.json with

{
  "exec-opts": ["native.cgroupdriver=systemd"]
}

and

{
  "exec-opts": ["native.cgroupdriver=cgroupfs"]
}

on both Ubuntu 22.04 (cgroups v2) and Ubuntu 20.04 (cgroups v1); in all 4 cases the standard redis example job was able to launch and run fine.

[github-actions]

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