Add a batched [] for DNS refreshing on host renames

This will replace the existing DnsRefreshForHostRenameAction.

This is stage one of a three stage migration process. It adds the new queue and
[] but doesn't call them yet. Stage two will cut over to using the new
functionality, and stage three will remove the old functionality.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=134793963

javatests/google/registry/testing/DatastoreHelper.java

@@ -126,6 +126,13 @@ public class DatastoreHelper {
         domainName, generateNewDomainRoid(getTldFromDomainName(domainName)), contact);
   }
 
+  public static DomainResource newDomainResource(String domainName, HostResource host) {
+    return newDomainResource(domainName)
+        .asBuilder()
+        .setNameservers(ImmutableSet.of(Key.create(host)))
+        .build();
+  }
+
   public static DomainResource newDomainResource(
       String domainName, String repoId, ContactResource contact) {
     Key<ContactResource> contactKey = Key.create(contact);

javatests/google/registry/testing/FakeClock.java

@@ -19,6 +19,7 @@ import static org.joda.time.DateTimeZone.UTC;
 import static org.joda.time.Duration.millis;
 
 import google.registry.util.Clock;
+import java.io.Serializable;
 import java.util.concurrent.atomic.AtomicLong;
 import javax.annotation.concurrent.ThreadSafe;
 import org.joda.time.DateTime;
@@ -27,7 +28,9 @@ import org.joda.time.ReadableInstant;
 
 /** A mock clock for testing purposes that supports telling, setting, and advancing the time. */
 @ThreadSafe
-public final class FakeClock implements Clock {
+public final class FakeClock implements Clock, Serializable {
+
+  private static final long serialVersionUID = 675054721685304599L;
 
   // Clock isn't a thread synchronization primitive, but tests involving
   // threads should see a consistent flow.

javatests/google/registry/testing/FakeSleeper.java

@@ -18,12 +18,15 @@ import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 
 import google.registry.util.Sleeper;
+import java.io.Serializable;
 import javax.annotation.concurrent.ThreadSafe;
 import org.joda.time.ReadableDuration;
 
 /** Sleeper implementation for unit tests that advances {@link FakeClock} rather than sleep. */
 @ThreadSafe
-public final class FakeSleeper implements Sleeper {
+public final class FakeSleeper implements Sleeper, Serializable {
+
+  private static final long serialVersionUID = -8975804222581077291L;
 
   private final FakeClock clock;