[CRIU] Fix cpuset restore-in-root bug

[Tycho Andersen]

Hi all,

Based on some discussion, we shouldn't try to do any intelligent copying of any
properties anywhere else in the tree. These cpuset properties are special only
in the sense that they need to be restored before the move_in_cgroup call, and
if the parent cgroups have conflicting options (or empty options), it is best
to just let the restore fail.

Also, I noticed when making this patch that I am getting a lot of:

(00.092575)    290: Error (util.c:101): Unable to close fd 1016: Bad file descriptor

but it seems to be unrelated (i.e. these occurr on git master).

Tycho