[libvirt] [PATCH 0/2][RESEND] Fix problems on using lxc with cgroup ns subsystem

The patch set fixes two problems of lxc that happen when ns subsystem is enabled with memory subsystem at the same time. The fist problem is that cgroup subdirectories that are automatically created by ns subsystem remain after domain shutdown. The second problem is that memory usage is not properly accounted. Ryota Ozaki (2): cgroup: Change virCgroupRemove to remove all child groups at first cgroup: Enable memory.use_hierarchy of cgroup for domain