test[protocol]: revert test protocol

protocol/src/test/java/com/zfoo/protocol/packet/ObjectA.java

@@ -24,12 +24,19 @@ import java.util.Objects;
  */
 public class ObjectA implements IPacket {
 
+    public static final transient short PROTOCOL_ID = 102;
+
     private int a;
 
     private Map<Integer, String> m;
 
     private ObjectB objectB;
 
+    @Override
+    public short protocolId() {
+        return PROTOCOL_ID;
+    }
+
     public int getA() {
         return a;
     }

protocol/src/test/java/com/zfoo/protocol/packet/ObjectB.java

@@ -23,8 +23,15 @@ import java.util.Objects;
  */
 public class ObjectB implements IPacket {
 
+    public static final transient short PROTOCOL_ID = 103;
+
     private boolean flag;
 
+    @Override
+    public short protocolId() {
+        return PROTOCOL_ID;
+    }
+
     public boolean isFlag() {
         return flag;
     }