libcontainer/intelrdt: update code comments
libcontainer/intelrdt: update code comments

Use the term "clos group" instead of "container_id group" as the group
that a container belongs to is not necessarily tied to its container id.

Signed-off-by: Markus Lehtonen <7240084fba8db479724af16db3fa4c3939f977f0@intel.com>

kolyshkin/runc,kolyshkin/runc,kolyshkin/runc,rhatdan/runc,dqminh/runc,rhatdan/runc,dqminh/runc,kolyshkin/runc,opencontainers/runc,opencontainers/runc,opencontainers/runc,rhatdan/runc,rhatdan/runc,opencontainers/runc,dqminh/runc,dqminh/runc