Comment by dbaxps for Take a look at RDO Mitaka & Several External Networks VLAN Provider Setup External vlan provider network has been utilized above, e.g. non-bridged external networking helps out.

IT DOES WORK. Follow my post on Linux.com. Setup RDO Newton/Mitaka/Liberty install on virgin CentOS 7.3 box from scratch.
RDO Newton AIO Setup - http://lxer.com/module/newswire/view/236067/index.html