Changing tree map interface to only allow a value type parameter, key is always string.

Change-Id: I727e62401998fec63acf9e584cfb79a6ed02b569
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMap.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMap.java
index 3baadde..758a36c 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMap.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMap.java
@@ -74,7 +74,7 @@
  */
 @ResourceTypeInfo(id = -155, factory = AtomixConsistentTreeMapFactory.class)
 public class AtomixConsistentTreeMap extends AbstractResource<AtomixConsistentTreeMap>
-        implements AsyncConsistentTreeMap<String, byte[]> {
+        implements AsyncConsistentTreeMap<byte[]> {
 
     private final Map<MapEventListener<String, byte[]>, Executor>
             mapEventListeners = Maps.newConcurrentMap();