Add unit test for LISP address to check obj equality & construction

This commit adds various unit tests of LISP addresses in a way to
check object equality and construction.
This commit also makes minor changes to existing LISP address
classes to allow the test cases to pass all unit tests.

Change-Id: Ice9f9634bdd243baaf1eed1539ea8d5808dda01d
diff --git a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispMacAddress.java b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispMacAddress.java
index 4c0e539..3a36255 100644
--- a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispMacAddress.java
+++ b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispMacAddress.java
@@ -17,6 +17,8 @@
 
 import org.onlab.packet.MacAddress;
 
+import java.util.Objects;
+
 /**
  * MAC address that is used by LISP Locator.
  */
@@ -50,7 +52,16 @@
 
     @Override
     public boolean equals(Object obj) {
-        return address.equals(obj);
+        if (this == obj) {
+            return true;
+        }
+
+        if (obj instanceof LispMacAddress) {
+            final LispMacAddress other = (LispMacAddress) obj;
+            return Objects.equals(this.address, other.address) &&
+                    Objects.equals(this.getAfi(), other.getAfi());
+        }
+        return false;
     }
 
     @Override