handle grouped cgroup mounts (e.g. cpu,cpuacct)
handle grouped cgroup mounts (e.g. cpu,cpuacct)

Signed-off-by: Fabian Ruff <644850cb8939d255ed752957b7c4458c52900f75@progra.de>

cloudfoundry-incubator/garden-linux,cloudfoundry-incubator/garden-linux,cloudfoundry-incubator/garden-linux