Add options for isolating etcd, planes and etc

[rimusz]

@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