94634b4b03
When running unprivileged containers, we run into a scenario where an unpriv owned cgroup has a subcgroup delegated to another user (i.e. the container's own UIDs). When the owner of that cgroup dies without cleaning it up then the unpriv service manager might encounter a cgroup it cannot delete anymore. Let's address that: let's expose a method call on the service manager (primarly in PID1) that can be used to delete a subcgroup of a unit one owns. This would then allow the unpriv service manager to ask the priv service manager to get rid of such a cgroup. This commit only adds the method call, the next commit then adds the code that makes use of this.
System and Service Manager
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