Fix windows vbox path, and dockerport forward off by default.

The first commit makes Windows work again (this was the bug that made me back out the vmware refactor in 1.1.1)

the second fixes the defaulting to not port forwarding the Docker port and  `-v` verbose , by making the Driver responsible for its own parameters.

This will only add the parameters for the currently selected driver - but for now, that's a very expert UX issue we can work on later.