Vagrant Synced Folder Vagrantfile Breakout

This module exploits a default Vagrant synced folder (shared folder)
to append a Ruby payload to the Vagrant project Vagrantfile config file.

By default, unless a Vagrant project explicitly disables shared folders,
Vagrant mounts the project directory on the host as a writable 'vagrant'
directory on the guest virtual machine. This directory includes the
project Vagrantfile configuration file.

Ruby code within the Vagrantfile is loaded and executed when a user
runs any vagrant command from the project directory on the host,
leading to execution of Ruby code on the host.