Add log when model registrators activates

Change-Id: Id0d3157f39b7022412d24d62dbcdd3f64ac747fa
diff --git a/apps/yang/src/main/java/org/onosproject/yang/AbstractYangModelRegistrator.java b/apps/yang/src/main/java/org/onosproject/yang/AbstractYangModelRegistrator.java
index a1c74c7..a068526 100644
--- a/apps/yang/src/main/java/org/onosproject/yang/AbstractYangModelRegistrator.java
+++ b/apps/yang/src/main/java/org/onosproject/yang/AbstractYangModelRegistrator.java
@@ -81,7 +81,9 @@
 
     @Activate
     protected void activate() {
+        log.info("Starting...");
         model = getYangModel(loaderClass);
+        log.info("ModelId: {}", model.getYangModelId());
         ModelRegistrationParam.Builder b =
                 DefaultModelRegistrationParam.builder().setYangModel(model);
         registrationParam = getAppInfo(b).setYangModel(model).build();