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Fix kublelet killing VMs upon Virtlet pod restart
The culprit were cgroups that aren't handled by libvirt. Of those, we already handle hugetlb by moving the emulator process out of it. Still, need to do the same for systemd (name=systemd) and pids cgroup controllers. The problem manifested itself when cgroup-per-qos is enabled for kubelet. This is the default, but in current kdc it may be disabled as a workaround for old kubelet bug. This bug is already fixed, so the workaround is to be removed soon.
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