Fix the LispMessageEncoder to reply with UDP message sender

- Add AbstractLispMessage to store sender IP address per message
- Fix the LispMacAuthentication class to accept byte array as input
- Rename LispMessageEncoderTest class
- Try to use MessageToMessageEncoder to result in UDP message

Change-Id: I977302cdadf5c96c60c889be291ad5d90e3bc7cf
diff --git a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/protocols/AbstractLispMessage.java b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/protocols/AbstractLispMessage.java
new file mode 100644
index 0000000..2cc0480
--- /dev/null
+++ b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/protocols/AbstractLispMessage.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.lisp.msg.protocols;
+
+import io.netty.buffer.ByteBuf;
+import org.onosproject.lisp.msg.exceptions.LispWriterException;
+
+import java.net.InetSocketAddress;
+
+/**
+ * Abstract LISP message.
+ */
+public abstract class AbstractLispMessage implements LispMessage {
+
+    protected InetSocketAddress sender;
+
+    @Override
+    public LispType getType() {
+        return null;
+    }
+
+    @Override
+    public void configSender(InetSocketAddress sender) {
+        this.sender = sender;
+    }
+
+    @Override
+    public InetSocketAddress getSender() {
+        return sender;
+    }
+
+    @Override
+    public void writeTo(ByteBuf byteBuf) throws LispWriterException {
+    }
+
+    @Override
+    public Builder createBuilder() {
+        return null;
+    }
+}