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softreboot: add survivors.slice for surviving services
Add a new special top-level slice, survivors.slice. Units nested under this slice will not be stopped/restarted during a soft reboot operation. By defining this interface, we make the promise to users that we will do what's necessary to ensure the functionality is provided as expected, regardless of what changes under the hood. Implement the killing spree on soft reboot at the cgroup level, iterating over the remaining top-level cgroups and sending SIGTERM and SIGKILL to all apart from init.scope and survivors.slice. For this reason, this is supported only with cgroupsv2, but we intend to deprecated cgroupsv1 anyway. At the moment this interface implies the following: - not being sent SIGTERM/SIGKILL on final shutdown - no conflict/ordering with shutdown/softreboot targets - conflict/ordering with poweroff/halt/reboot/kexec targets - ignored on isolate when booting/shutting down the manager
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