func serviceList(w http.ResponseWriter, r *http.Request, t auth.Token) error {
	contexts := permission.ContextsForPermission(t, permission.PermServiceRead)
	services, err := provisionReadableServices(t, contexts)
	if err != nil {
		return err
	}
	sInstances, err := service.GetServiceInstancesByServices(services)
	if err != nil {
		return err
	}
	results := make([]service.ServiceModel, len(services))
	for i, s := range services {
		results[i].Service = s.Name
		for _, si := range sInstances {
			if si.ServiceName == s.Name {
				results[i].Instances = append(results[i].Instances, si.Name)
				results[i].ServiceInstances = append(results[i].ServiceInstances, si)
			}
		}
	}
	if len(results) == 0 {
		w.WriteHeader(http.StatusNoContent)
		return nil
	}
	w.Header().Set("Content-Type", "application/json")
	return json.NewEncoder(w).Encode(results)
}
func serviceList(w http.ResponseWriter, r *http.Request, t auth.Token) error {
	contexts := permission.ContextsForPermission(t, permission.PermServiceRead)
	services, err := provisionReadableServices(t, contexts)
	if err != nil {
		return err
	}
	sInstances, err := service.GetServiceInstancesByServices(services)
	if err != nil {
		return err
	}
	results := make([]service.ServiceModel, len(services))
	for i, s := range services {
		results[i].Service = s.Name
		for _, si := range sInstances {
			if si.ServiceName == s.Name {
				results[i].Instances = append(results[i].Instances, si.Name)
				results[i].ServiceInstances = append(results[i].ServiceInstances, si)
			}
		}
	}
	if len(results) == 0 {
		w.WriteHeader(http.StatusNoContent)
		return nil
	}
	w.Header().Set("Content-Type", "application/json")
	return json.NewEncoder(w).Encode(results)
}
// title: service list
// path: /services
// method: GET
// produce: application/json
// responses:
//   200: List services
//   204: No content
//   401: Unauthorized