A virtual building and testing environment using Vagrant

This patch provides all necessary files and configurations to
build a Vagrantbox that can be used as building and testing
environment for all OpenStack manuals and documentations. It
includes the repositories like openstack-manuals. Tox, Maven
and all needed dependencies by Maven are already
installed/fetched.

Change-Id: Ic7a496ee16efffc7ae41f657a07af998436ea12e
Closes-Bug: #1317849
Merge "A virtual building and testing environment using Vagrant"