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Previously we were testing whether /sys/fs/cgroup/systemd/ was a mount point. This might be problematic however, when the cgroup trees are bind mounted into a container from the host (which should be absolutely valid), which might create the impression that the container was running systemd, but only the host actually is. Replace this by a check for the existance of the directory /run/systemd/system/, which should work unconditionally, since /run can never be a bind mount but *must* be a tmpfs on systemd systems, which is flushed at boots. This means that data in /run always reflects information about the current boot, and only of the local container, which makes it the perfect choice for a check like this. (As side effect this is nice to Ubuntu people who now use logind with the systemd cgroup hierarchy, where the old sd_booted() check misdetects systemd, even though they still run legacy Upstart.)