I installed openstack(queen version) and cloudbreak on 2 different VM. As per the hortonworks document created credentials as well, but while launching the cluster getting this error: image copy failed.
Seems the issue is the image is not available in your openstack installation. I don't know where are the official images are located, but you can burn your own any time. For more information please check https://github.com/hortonworks/cloudbreak-images