Fix flaky test in jaegerremotesampling

Fixes #9113

Signed-off-by: Juraci Paixão Kröhling <[email protected]>

extension/jaegerremotesampling/extension_test.go

@@ -59,14 +59,15 @@ func TestStartAndShutdownRemote(t *testing.T) {
 
 	// create the mock server
 	server := grpc.NewServer()
+
+	// register the service
+	api_v2.RegisterSamplingManagerServer(server, &samplingServer{})
+
 	go func() {
 		err = server.Serve(lis)
 		require.NoError(t, err)
 	}()
 
-	// register the service
-	api_v2.RegisterSamplingManagerServer(server, &samplingServer{})
-
 	// create the config, pointing to the mock server
 	cfg := createDefaultConfig().(*Config)
 	cfg.Source.Remote = &configgrpc.GRPCClientSettings{