Add options for isolating etcd,  planes and etc

@krancour would be nice to have options of isolating:
1) etcd (ask how many members are needed 3 or 5, maybe for testing purposes an option of 1 etcd would be good to have too)
2) Control Planes
3) Data Planes
4) Router Mesh
which should provide a separate cloud-config file for each then to be used to provision the cluster
