Imports
- github.com/hashicorp/packer/helper/config
- github.com/hashicorp/packer/packer
- github.com/hashicorp/packer/common
- github.com/hashicorp/packer/template/interpolate
- github.com/hashicorp/packer/builder/virtualbox/common
- github.com/hashicorp/packer/helper/communicator
- github.com/mitchellh/multistep