Add device config change request using NetCfg

Change-Id: I01ae9caf298e606333ea31b2b480d744a2815c76
diff --git a/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiNepRef.java b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiNepRef.java
index af4d299..95b3e05 100644
--- a/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiNepRef.java
+++ b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiNepRef.java
@@ -42,7 +42,7 @@
  * TAPI reference class should be used in ODTN ServiceApplication
  * in order to make independent ServiceApplication implementation from DCS.
  */
-public class TapiNepRef {
+public final class TapiNepRef {
 
     protected final Logger log = getLogger(getClass());