Exit on connection loss

Exist when a driver closes its socket.

1. The attacher caches driver capabilities, which could (in theory) change
after driver restart.

2. New driver may not come up for a while and the attacher should not act
as leader during this time.

Author: jsafrane

cmd/csi-attacher/main.go

@@ -105,7 +105,7 @@ func main() {
 	factory := informers.NewSharedInformerFactory(clientset, *resync)
 	var handler controller.Handler
 	// Connect to CSI.
-	csiConn, err := connection.Connect(*csiAddress)
+	csiConn, err := connection.Connect(*csiAddress, connection.OnConnectionLoss(connection.ExitOnConnectionLoss()))
 	if err != nil {
 		klog.Error(err.Error())
 		os.Exit(1)