Has anybody tried to get the Docker Heat Plugin for Juno release working?

What I did was (on CentOS 7):

cloned the proposed/juno branch from github:

$ git clone -b proposed/juno https://github.com/openstack/heat.git

$ cd heat

$ mkdir /usr/lib/heat

$ cp -r contrib/heat_docker/heat_docker/ /usr/lib/heat/

$ vi /etc/heat/heat.conf

and set:

plugin_dirs=/var/lib/heat/heat_docker

$ systemctl restart openstack-heat-engine

but by running:

$ heat resource-type-list | grep Docker

it doesn't give me the desired output:

DockerInc::Docker::Container

Any ideas?