libcgroup: Dont check for success of moved tasks

libcgroup: Dont check for success of moved tasks

Sometime the movement of tasks in the default cgroup can fail for
various reasons. Therefore, do not check for the success of the
movement of tasks.

Justification: These are generally for cgroups which need some special
setup, for example the RT group scheduler. This is not handled by the
library whihc is generic. If a user is intersted in these working, they
will setup a default cgroup in the config files whihc handle everything
they need.

Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Tested-by: Jan Safranek <jsafrane@redhat.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>