Fix cgroup setup code to cope with root squashing NFS
When a disk is on a root squashed NFS server, it may not be possible to stat() the disk file in virCgroupAllowDevice. The virStorageFileGetMeta method may also fail to extract the parent backing store. Both of these errors have to be ignored to avoid breaking NFS deployments * src/qemu/qemu_driver.c: Ignore errors in cgroup setup to keep root squash NFS happy
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