test/cgroup02: Clean newroot dir from all controllers in hooks
test/cgroup02: Clean newroot dir from all controllers in hooks

From avagin@:
  And here is one more problem. the newroot directory is created for all
  controllers, but currently test cleans up it only for the zdtmtst
  controller. We need to find a way to clean up all other conntrollers.
   Tests are executed on a node, which is rebooted only for updating
  kernel, so if we will not clean up all other controllers, we can eat all
  memory.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>
Tested-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>

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