Fixes mitchellh/vagrant #3361 for VirtualBox 4.3.x
Fixes mitchellh/vagrant #3361 for VirtualBox 4.2.x
Fixes mitchellh/vagrant #3361 for VirtualBox 4.3.x, including internal networks
Fixes mitchellh/vagrant #3361 for VirtualBox 4.2.x, including internal networks
Merge pull request #3365 from oscarrenalias/master

providers/virtualbox: Fixes for cable not connected in VirtualBox 4.3 (and 4.2)