Make name and address fields required on Registrar

The absence of these fields causes RDE failures, so they are in effect
required on any functioning registry system. We are currently
experiencing problems in sandbox caused by null values on these fields.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=155474895

javatests/google/registry/whois/NameserverWhoisResponseTest.java

@@ -16,7 +16,7 @@ package google.registry.whois;
 
 import static com.google.common.truth.Truth.assertThat;
 import static google.registry.testing.DatastoreHelper.createTld;
-import static google.registry.testing.DatastoreHelper.persistResource;
+import static google.registry.testing.DatastoreHelper.persistNewRegistrar;
 import static google.registry.whois.WhoisHelper.loadWhoisTestFile;
 
 import com.google.common.collect.ImmutableList;
@@ -50,13 +50,7 @@ public class NameserverWhoisResponseTest {
 
   @Before
   public void setUp() {
-    persistResource(new Registrar.Builder()
-        .setClientId("example")
-        .setRegistrarName("Example Registrar, Inc.")
-        .setType(Registrar.Type.REAL)
-        .setIanaIdentifier(8L)
-        .build());
-
+    persistNewRegistrar("example", "Example Registrar, Inc.", Registrar.Type.REAL, 8L);
     createTld("tld");
 
     hostResource1 = new HostResource.Builder()