Fix ControlledDynamicWebAppCluster transient on-fire

Was seeing cluster getting "on-fire" icon in web-console sometimes. Was probably caused by propagating SERVICE_STATE from cluster and SERVICE_UP from load balancer - if values didn't agree then would be shown with the on-fire icon.

However, before realising that (!) I fixed it by adding SERVICE_STATE explicitly in start/stop, in much the same way as AbstractApplication does it.