[ONOS-6142] Add AppData and AS extension addresses with unit test

- Correct RFC page number for LCAF addresses

Change-Id: I51dbf02f69c15aad81d5571198b39e030f991a96
diff --git a/drivers/lisp/src/main/java/org/onosproject/drivers/lisp/extensions/LispSegmentAddress.java b/drivers/lisp/src/main/java/org/onosproject/drivers/lisp/extensions/LispSegmentAddress.java
index c48a80c..b251724 100644
--- a/drivers/lisp/src/main/java/org/onosproject/drivers/lisp/extensions/LispSegmentAddress.java
+++ b/drivers/lisp/src/main/java/org/onosproject/drivers/lisp/extensions/LispSegmentAddress.java
@@ -20,14 +20,20 @@
 import org.onosproject.mapping.addresses.ExtensionMappingAddressType;
 import org.onosproject.net.flow.AbstractExtension;
 
+import static org.onosproject.mapping.addresses.ExtensionMappingAddressType
+                            .ExtensionMappingAddressTypes.SECURITY_ADDRESS;
+
 /**
  * Implementation of LISP segment address.
+ * When multiple organizations inside of a LISP site are using private addresses
+ * [RFC1918] as EID-prefixes, their address spaces must remain segregated due
+ * to possible address duplication.
  */
 public class LispSegmentAddress extends AbstractExtension
                                             implements ExtensionMappingAddress {
     @Override
     public ExtensionMappingAddressType type() {
-        return null;
+        return SECURITY_ADDRESS.type();
     }
 
     @Override