add support for virtualbox host
add support for virtualbox host

Signed-off-by: Joshua Colson <945b5b30a087f5f76327dfceeb3d104f57c97034@gmail.com>

mattray/ohai,higanworks/ohai,chef/ohai,higanworks/ohai,jaymzh/ohai,mattray/ohai,jaymzh/ohai,chef/ohai