Setup work network

This small patch add a configuration config.windows.set_work_network (false by default) as a way to solve #63.

If false, nothing changes, if true, every network is automatically setup as a 'work' network. This is the only way I managed to make winrm work on an interface set up as bridged.

I am not sure it is even a good idea, there has to be a way to make winrm works on a public network, but I have not found it yet.