Clarify and add more details to some log messages

Change-Id: I3b9df11748e41e857ed0bc3e166d1434743902de
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
index 770c3d9..f694dee 100644
--- a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
@@ -496,7 +496,7 @@
         public void triggerCompile(Iterable<Key> intentKeys,
                                    boolean compileAllFailed) {
             // TODO figure out who is making excessive calls?
-            log.trace("submitting {} + all?:{}", intentKeys, compileAllFailed);
+            log.trace("submitting {} + all?:{} for compilation", intentKeys, compileAllFailed);
             buildAndSubmitBatches(intentKeys, compileAllFailed);
         }
     }