Test our vagrant-libvirt -based build system with Jessie's Vagrant
Originally created by @intrigeri on #8086 (Redmine)
Vagrant 1.6.5+dfsg1-1 got uploaded to Debian, and will likely be part of Jessie. As long as our main “easy” build system is using Vagrant, we should try to support that version.
Feature Branch: feature/6354-vagrant-libvirt
Parent Task: #6354 (closed)