func (super *Supervisor) Start(ctx context.Context, cfg *arvados.Config, cfgPath string) {
super.ctx, super.cancel = context.WithCancel(ctx)
super.done = make(chan struct{})
func (super *Supervisor) Start(ctx context.Context, cfg *arvados.Config, cfgPath string) {
super.ctx, super.cancel = context.WithCancel(ctx)
super.done = make(chan struct{})