Direct access to vagrantbox on virtualbox/macos

During the platform handson workshop we discovered that the Vagrantfile from leap_platform works with vagrant-libvirt/ubuntu, but on MacOS and virtualbox we encountered networking problems. ppl could not ping the box after deploy. They succeeded only by manually adding a second, private network. We need to investigate how to reproduce and fix.

(from redmine: created on 2016-01-02)