2aa57a655004c8f9fba48eeb71aa9a31fdf3c94b
We add units to the cgroup realization queue when propagating realizing requests to sibling units, and when invalidating cgroup settings because some cgroup setting changed. In the time between where we add the unit to the queue until the cgroup is actually dispatched the unit's state might have changed however, so that the unit doesn't actually need to be realized anymore, for example because the unit went down. To handle that, check the unit state again, if realization makes sense. Redundant realization is usually not a problem, except when the unit is not actually running, hence check exactly for that.
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