systemd example unit and environment files

The binary names in these are

kube-apiserver
kube-controller-manager
kube-scheduler
kube-proxy
kubelet

The environment/config files need to live in /etc/kubernetes/

I personally like the namespaced binaries a lot more than just 'apiserver' etc.  I wouldn't mind if we switched the binary names to something namespaced in the in project build...
We are going to have to add a param for the portal net range.  See:
https://github.com/GoogleCloudPlatform/kubernetes/blob/343677580a5af96e700c8b191245a23a8b178387/pkg/registry/service/rest.go#L195
https://github.com/GoogleCloudPlatform/kubernetes/blob/343677580a5af96e700c8b191245a23a8b178387/cluster/gce/config-default.sh#L34

This is a networks pace that doesn't overlap with other stuff that we can put synthetic services on.