Remove the old RegistryConfig paradigm entirely

We are now ready to begin configuration using YAML, mediated by ConfigModule.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=143818507

javatests/google/registry/model/ofy/CommitLogCheckpointTest.java

@@ -21,7 +21,6 @@ import static org.joda.time.DateTimeZone.UTC;
 import com.google.common.collect.ImmutableMap;
 import google.registry.testing.AppEngineRule;
 import google.registry.testing.ExceptionRule;
-import google.registry.testing.RegistryConfigRule;
 import org.joda.time.DateTime;
 import org.junit.Rule;
 import org.junit.Test;
@@ -37,9 +36,6 @@ public class CommitLogCheckpointTest {
       .withDatastore()
       .build();
 
-  @Rule
-  public final RegistryConfigRule configRule = new RegistryConfigRule();
-
   @Rule
   public final ExceptionRule thrown = new ExceptionRule();