* docker: disable driver when running as non-root on cgroups v2 hosts
This PR modifies the docker driver to behave like exec when being run
as a non-root user on a host machine with cgroups v2 enabled. Because
of how cpu resources are managed by the Nomad client, the nomad agent
must be run as root to manage docker-created cgroups.
* cl: update cl
Seth Hoenig