[#1342] network/cache: Add node address to error multiClient

Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

pkg/network/cache/multi.go

@@ -155,7 +155,7 @@ func (x *multiClient) iterateClients(ctx context.Context, f func(clientcore.Clie
 	group.IterateAddresses(func(addr network.Address) bool {
 		select {
 		case <-ctx.Done():
-			firstErr = context.Canceled
+			firstErr = fmt.Errorf("client connection error at %v: %w", addr, context.Canceled)
 			return true
 		default:
 		}