Replace ExceptionRule with ExpectedException

This is in preparation for running the automatic refactoring script that
will replace all ExpectedExceptions with use of JUnit 4.13's assertThrows/
expectThrows.

Note that I have recorded the callsites of assertions about EppExceptions
being marshallable and will edit those specific assertions back in after
running the automatic refactoring script (which do not understand these).

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=178812403

javatests/google/registry/util/UrlFetchUtilsTest.java

@@ -30,7 +30,6 @@ import static org.mockito.Mockito.verifyNoMoreInteractions;
 import com.google.appengine.api.urlfetch.HTTPHeader;
 import com.google.appengine.api.urlfetch.HTTPRequest;
 import google.registry.testing.AppEngineRule;
-import google.registry.testing.ExceptionRule;
 import google.registry.testing.InjectRule;
 import java.util.Arrays;
 import java.util.List;
@@ -38,6 +37,7 @@ import java.util.Random;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 import org.mockito.ArgumentCaptor;
@@ -51,7 +51,7 @@ public class UrlFetchUtilsTest {
       .build();
 
   @Rule
-  public final ExceptionRule thrown = new ExceptionRule();
+  public final ExpectedException thrown = ExpectedException.none();
 
   @Rule
   public final InjectRule inject = new InjectRule();