Clean up some areas in preparation for externalized codebase

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=221454055

java/google/registry/util/CidrAddressBlock.java

@@ -455,6 +455,8 @@ public class CidrAddressBlock implements Iterable<InetAddress>, Serializable {
     };
   }
 
+  // InetAddresses.coerceToInteger() will be deprecated in the future.
+  @SuppressWarnings("deprecation")
   @Override
   public int hashCode() {
     return InetAddresses.coerceToInteger(ip);