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/LispIpv4Address.java b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispIpv4Address.java
index 3a47063..31d607b 100644
--- a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispIpv4Address.java
+++ b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispIpv4Address.java
@@ -17,6 +17,8 @@
 
 import org.onlab.packet.IpAddress;
 
+import java.util.Objects;
+
 import static com.google.common.base.Preconditions.checkArgument;
 
 /**
@@ -33,4 +35,23 @@
         super(address, AddressFamilyIdentifierEnum.IP);
         checkArgument(address.isIp4());
     }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+
+        if (obj instanceof LispIpv4Address) {
+            final LispIpv4Address other = (LispIpv4Address) obj;
+            return Objects.equals(this.address, other.address) &&
+                    Objects.equals(this.getAfi(), other.getAfi());
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(address, getAfi());
+    }
 }
diff --git a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispIpv6Address.java b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispIpv6Address.java
index 7c2a60e..f486d28 100644
--- a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispIpv6Address.java
+++ b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispIpv6Address.java
@@ -17,6 +17,8 @@
 
 import org.onlab.packet.IpAddress;
 
+import java.util.Objects;
+
 import static com.google.common.base.Preconditions.checkArgument;
 
 /**
@@ -33,4 +35,23 @@
         super(address, AddressFamilyIdentifierEnum.IP);
         checkArgument(address.isIp6());
     }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+
+        if (obj instanceof LispIpv6Address) {
+            final LispIpv6Address other = (LispIpv6Address) obj;
+            return Objects.equals(this.address, other.address) &&
+                    Objects.equals(this.getAfi(), other.getAfi());
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(address, getAfi());
+    }
 }
diff --git a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispListLcafAddress.java b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispListLcafAddress.java
index 09f681a..85e5a86 100644
--- a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispListLcafAddress.java
+++ b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispListLcafAddress.java
@@ -15,6 +15,8 @@
  */
 package org.onosproject.lisp.msg.types;
 
+import com.google.common.collect.ImmutableList;
+
 import java.util.List;
 import java.util.Objects;
 
@@ -61,6 +63,7 @@
      */
     public LispListLcafAddress(List<LispAfiAddress> addresses) {
         super(LispCanonicalAddressFormatEnum.LIST, LENGTH);
+        this.addresses = addresses;
     }
 
     /**
@@ -69,7 +72,7 @@
      * @return a set of AFI addresses
      */
     public List<LispAfiAddress> getAddresses() {
-        return addresses;
+        return ImmutableList.copyOf(addresses);
     }
 
     @Override
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