This commit contains changes for docker:
* user.GetGroupFile to user.GetGroupPath docker/libcontainer#301
* Add systemd support for OOM docker/libcontainer#307
* Support for custom namespaces docker/libcontainer#279, docker/libcontainer#312
* Fixes#9699docker/libcontainer#308
Signed-off-by: Alexander Morozov <lk4d4@docker.com>
Upstream-commit: 50905a6d6ce2fdd1ab0c33ec0b7a26895e0cbeea
Component: engine