Log for pending configuration

Change-Id: I17ca41de66862eb5c6f818cc0bce7ee8e371fc79
diff --git a/core/net/src/main/java/org/onosproject/net/config/impl/NetworkConfigManager.java b/core/net/src/main/java/org/onosproject/net/config/impl/NetworkConfigManager.java
index b2a17a4..cdceec0 100644
--- a/core/net/src/main/java/org/onosproject/net/config/impl/NetworkConfigManager.java
+++ b/core/net/src/main/java/org/onosproject/net/config/impl/NetworkConfigManager.java
@@ -221,6 +221,7 @@
         if (configClass != null) {
             return store.applyConfig(subject, (Class<C>) configClass, json);
         } else {
+            log.info("Configuration \'{}\' queued for subject {}", configKey, subject);
             store.queueConfig(subject, configKey, json);
             return null;
         }