def machine_auto_networks(machine)
      machine.config.vm.networks.select do |(net_type, options)|
        net_type == :private_network and options[:auto_network]
      end
    end
def machine_auto_networks(machine)
      machine.config.vm.networks.select do |(net_type, options)|
        net_type == :private_network and options[:auto_network]
      end
    end
Fetch all private networks that are tagged for auto networking

 @param machine [Vagrant::Machine]

 @return [Array(Symbol, Hash)] All auto_networks