Added a missing import, as detected during tests of the tutorial
Added a missing import, as detected during tests of the tutorial

wvdemeer/docker-am,dmargery/bootstrap-geni-am,wvdemeer/docker-am,plantigrade/bootstrap-geni-am,open-multinet/docker-am,wvdemeer/docker-am,open-multinet/docker-am,open-multinet/docker-am,wvdemeer/docker-am,open-multinet/docker-am