pool: fix the string to wait for AIO health check

REST 0.8.0+ doesn't output this string and we better check for the overall AIO
status which is known to be OK after this string.

Signed-off-by: Roman Khimov <roman@nspcc.ru>

pool/pool_aio_test.go

@@ -193,7 +193,7 @@ func createDockerContainer(ctx context.Context, t *testing.T, image string) test
 	req := testcontainers.ContainerRequest{
 		Image: image,
 		// timeout is chosen to have enough time for NeoFS chain deployment from scratch within NeoFS AIO
-		WaitingFor:   wait.NewLogStrategy("Serving neofs rest gw").WithStartupTimeout(2 * time.Minute),
+		WaitingFor:   wait.NewLogStrategy("aio container started").WithStartupTimeout(2 * time.Minute),
 		Name:         "sdk-poll-tests-" + strconv.FormatInt(time.Now().UnixNano(), 36),
 		Hostname:     "aio_autotest_" + strconv.FormatInt(time.Now().UnixNano(), 36),
 		ExposedPorts: []string{"8080/tcp"},