Extend info cmd with status of cgroup controllers #286
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This adds which controllers are attached to the cgroup v2 hierarchy. For devices I just check if it is possible to attach epbf programs to a cgroup. I also moved the freezer controller to pseudo controllers. While contrary to devices and unified, this is a real subsystem it is also quite different from the other controllers. More importantly you cannot read it from cgroup.controllers, nor write it to subtree_control which was one of the original motivations for introducing this distinction.