networker API facade

api: new Networker API facade

The original task was:
"new Networker API facade (client/server) with ListVLANsForMachine API call"
The additional tas was:
"Networker API" should do all network setup staff done by cloud-init

But all thing are changing and now Networker API has the only method calld
MachineNetworkInfo(machineTag string) ([]network.Info, error).