Make "kubecfg -s <port> run ..." select correctly

kubecfg run creates a replication controller which sets all pods with a
replicationController= label, but then sets up a service selecting on name=
instead.  This fixes that.  kubecfg -s <port> run ... can now actually work.
It looks like replication controller should be setting the replicationController label:
https://github.com/GoogleCloudPlatform/kubernetes/blob/master/pkg/controller/replication_controller.go#L59

Furthermore, this isn't a pattern we want to encourage. I'd like all related objects to share a label, and it shouldn't be named after the replication controller, which I see as ephemeral in the general case.

I propose changing the labels on the service, pods, and replication controller (which currently has no labels) to key `simpleService`.