cgroups: try to load cgmanager first If cgmanager is running, use it. This allows the admin to simply stop cgmanager if they don't want to use it. The other way there is no way to choose to use cgmanager. Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

implement lxc.mount.auto = cgroup for cgfsng Also add testcase for each of the cgroup{,-full}:{rw,ro,mixed} cases. Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>