Update libcontainer to 5589d4d879f1d7e31967a927d3e

Signed-off-by: Michael Crosby <michael@docker.com>
Update hack/vendor.sh to use libcontainer's update-vendor.sh script as the source of truth for libcontainer deps and not include them in Docker's repo twice

Signed-off-by: Andrew Page <admwiggin@gmail.com>
Update vendor with the updated canonical deps from libcontainer

Signed-off-by: Andrew Page <admwiggin@gmail.com>
Add maintainers to daemon/ and graph/

Signed-off-by: Solomon Hykes <solomon@docker.com>