Clean up Improved(Input|Output)Stream

Two main changes:

- Replaced getClass().getSimpleName() in the logs with a constructor-given name. Right now what we have is a lot of identical classes with slightly different names so that the logs would be different. With this change - we can later get rid of a lot of these classes and replace them with simple wrappers.

- Removed the "expected" feature. Only Tar uses it - and it can override onClose to do that (that's what it's there for!)

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=202129563

java/google/registry/rde/RydePgpSigningOutputStream.java

@@ -56,7 +56,7 @@ public class RydePgpSigningOutputStream extends ImprovedOutputStream {
   public RydePgpSigningOutputStream(
       @WillNotClose OutputStream os,
       PGPKeyPair signingKey) {
-    super(os, false, -1);
+    super("RydePgpSigningOutputStream", os, false);
     try {
       signer = new PGPSignatureGenerator(
           new BcPGPContentSignerBuilder(RSA_GENERAL, SHA256));