add docker_hosts fact
add docker_hosts fact

samuelson/pltraining-dockeragent,puppetlabs/pltraining-dockeragent,joshsamuelson/pltraining-dockeragent,binford2k/pltraining-dockeragent,samuelson/pltraining-dockeragent,puppetlabs/pltraining-dockeragent,binford2k/pltraining-dockeragent