cgroups/cgroup_regression_test: fix test_10 cleanup

test_10 can leave cgroups umounted before cleanup, make sure cgroups are mounted before doing cleanup. Also keep stderr output from rmdir and umount, if these fail it's better to have it in logs.

---
  .../controllers/cgroup/cgroup_regression_test.sh   |    5 +++--
  1 files changed, 3 insertions(+), 2 deletions(-)

index 09563ef..19c30fe 100755
@@ -502,8 +502,9 @@ test_10()
 	wait $pid1
 	wait $pid2
 
-	rmdir cgroup/0 2> /dev/null
-	umount cgroup/ 2> /dev/null
+	mount -t cgroup none cgroup 2> /dev/null
+	rmdir cgroup/0
+	umount cgroup/
 
 	check_kernel_bug
 	if [ $? -eq 1 ]; then

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