qemu: Make sure qemu can access its directory in hugetlbfs
When libvirtd is started, we create "libvirt/qemu" directories under hugetlbfs mount point. Only the "qemu" subdirectory is chowned to qemu user and "libvirt" remains owned by root. If umask was too restrictive when libvirtd started, qemu user may lose access to "qemu" subdirectory. Let's explicitly grant search permissions to "libvirt" directory for all users.
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