For KVM-based environments (which require nested virtualization support), update the README.md to note that VirtualBox is not supported. Also update the Vagrantfile for clearer indications that only VMware-based providers are supported.
Fixed a missing "end" statement in Vagrantfile
Remove all references to AppCatalyst from all Vagrantfiles. Start ensuring that all Vagrantfiles include references to VirtualBox.
Add Vagrantfile and supporting files to create a learning environment for KVM and Libvirt.