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.
kubecfg run was broken by https://github.com/GoogleCloudPlatform/kubernetes/commit/2444e4e1dc80d709dd700baf0bd53d7c63f48c70, which was part of #1142. 

@lavalamp @jbeda : What do you think about the proposal of `simpleService` for the label key on the objects created by kubecfg run?