chore: service throttles on public URLs & its known issue. (#477)

Author: munkhuushmgl

vision/snippets/src/test/java/com/example/vision/DetectLandmarksGcsTest.java

@@ -20,10 +20,12 @@
 
 import com.example.vision.snippets.DetectLandmarksGcs;
 import com.example.vision.snippets.DetectLandmarksUrl;
+import com.google.cloud.testing.junit4.MultipleAttemptsRule;
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -52,6 +54,9 @@ public void tearDown() {
     System.setOut(originalPrintStream);
   }
 
+  @Rule
+  public MultipleAttemptsRule multipleAttemptsRule = new MultipleAttemptsRule(3);
+
   @Test
   public void testLandmarksUrl() throws Exception {
     // Act