[ONOS-5916] Add various MappingAddress impl classes with unit tests

Change-Id: Ie373601d1406d161e8071e78cd584e5cc8b8f5af
diff --git a/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/MappingKey.java b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/MappingKey.java
index cbce738..146fbf9 100644
--- a/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/MappingKey.java
+++ b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/MappingKey.java
@@ -15,7 +15,7 @@
  */
 package org.onosproject.mapping;
 
-import org.onosproject.mapping.address.MappingAddress;
+import org.onosproject.mapping.addresses.MappingAddress;
 
 /**
  * Abstraction of network mapping key.