```ruby
require "vagrant"

module VagrantPlugins
  module ProviderVirtualBox
    class Plugin < Vagrant.plugin("2")
      name "VirtualBox provider"
      description <<-EOF
      The VirtualBox provider allows Vagrant to manage and control
      VirtualBox-based virtual machines.
      EOF

      provider(:virtualbox) do
        require File.expand_path("../provider", __FILE__)
        Provider
      end

      config(:virtualbox, :provider => :virtualbox) do
        require File.expand_path("../config", __FILE__)
        Config
      end
    end

    autoload :Action, File.expand_path("../action", __FILE__)

    # Drop some autoloads in here to optimize the performance of loading
    # our drivers only when they are needed.
    module Driver
      autoload :Meta, File.expand_path("../driver/meta", __FILE__)
      autoload :Version_4_0, File.expand_path("../driver/version_4_0", __FILE__)
      autoload :Version_4_1, File.expand_path("../driver/version_4_1", __FILE__)
      autoload :Version_4_2, File.expand_path("../driver/version_4_2", __FILE__)
    end

    module Model
      autoload :ForwardedPort, File.expand_path("../model/forwarded_port", __FILE__)
    end

    module Util
      autoload :CompileForwardedPorts, File.expand_path("../util/compile_forwarded_ports", __FILE__)
    end
  end
end
```

Set the virtualbox config scope
user
```ruby
require "vagrant"

module VagrantPlugins
  module ProviderVirtualBox
    class Plugin < Vagrant.plugin("2")
      name "VirtualBox provider"
      description <<-EOF
      The VirtualBox provider allows Vagrant to manage and control
      VirtualBox-based virtual machines.
      EOF

      provider(:virtualbox) do
        require File.expand_path("../provider", __FILE__)
        Provider
      end

      config(:virtualbox, :provider) do
        require File.expand_path("../config", __FILE__)
        Config
      end
    end

    autoload :Action, File.expand_path("../action", __FILE__)

    # Drop some autoloads in here to optimize the performance of loading
    # our drivers only when they are needed.
    module Driver
      autoload :Meta, File.expand_path("../driver/meta", __FILE__)
      autoload :Version_4_0, File.expand_path("../driver/version_4_0", __FILE__)
      autoload :Version_4_1, File.expand_path("../driver/version_4_1", __FILE__)
      autoload :Version_4_2, File.expand_path("../driver/version_4_2", __FILE__)
    end

    module Model
      autoload :ForwardedPort, File.expand_path("../model/forwarded_port", __FILE__)
    end

    module Util
      autoload :CompileForwardedPorts, File.expand_path("../util/compile_forwarded_ports", __FILE__)
    end
  end
end
```
assistant