Remove datastore related code (#1906)

util/src/main/java/google/registry/util/DiffUtils.java

@@ -55,7 +55,7 @@ public final class DiffUtils {
     }
   }
 
-  /** Pretty-prints a deep diff between two maps that represent Datastore entities. */
+  /** Pretty-prints a deep diff between two maps that represent entities. */
   public static String prettyPrintEntityDeepDiff(Map<?, ?> a, Map<?, ?> b) {
     return prettyPrintDiffedMap(deepDiff(a, b, true), null);
   }

util/src/main/java/google/registry/util/ListNamingUtils.java

@@ -17,9 +17,7 @@ package google.registry.util;
 import com.google.common.io.Files;
 import java.nio.file.Path;
 
-/**
- * A utility class for conversion of input file paths into names for entities in Datastore.
- */
+/** A utility class for conversion of input file paths into names for entities in the database. */
 public final class ListNamingUtils {
 
   /** Turns a file path into a name suitable for use as the name of a premium or reserved list. */

util/src/main/java/google/registry/util/RegistrarUtils.java

@@ -31,8 +31,8 @@ public class RegistrarUtils {
 
   /**
    * Returns a normalized registrar ID by taking the input and making it lowercase and removing all
-   * characters that aren't alphanumeric or hyphens. The normalized id should be unique in
-   * Datastore, and is suitable for use in email addresses.
+   * characters that aren't alphanumeric or hyphens. The normalized id should be unique in the
+   * database, and is suitable for use in email addresses.
    */
   public static String normalizeRegistrarId(String registrarId) {
     return Ascii.toLowerCase(registrarId).replaceAll("[^a-z0-9\\-]", "");