The Broker is suppose to start with the Registry Container, but is not.
Running this command will start the Broker:
docker run -d --name broker -v /logs/broker:/root/lisatmp_10.1.0 --net="host" -p 1508:1508 -p 2009:2009 devtest/registry-broker-base /opt/devtest/bin/Broker
It will have to be modified to fit your environment as to where you write out the log files and what version of DevTest being run.
This is supposed to be fixed in a later release.