Reducing log level for peer update in IntentStore map

Change-Id: I0cc93784e2ca7dbb8c743840b6427f49a715b554
diff --git a/core/store/dist/src/main/java/org/onosproject/store/ecmap/EventuallyConsistentMapImpl.java b/core/store/dist/src/main/java/org/onosproject/store/ecmap/EventuallyConsistentMapImpl.java
index 23e2e5f..18cb3bc 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/ecmap/EventuallyConsistentMapImpl.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/ecmap/EventuallyConsistentMapImpl.java
@@ -353,6 +353,9 @@
             if (value.isPresent() && existing != null && existing.isAlive()) {
                 valueMatches = Objects.equals(value.get(), existing.get());
             }
+            if (existing == null) {
+                log.debug("ECMap Remove: Existing value for key {} is already null", k);
+            }
             updated.set(valueMatches && (existing == null || tombstone.isNewerThan(existing)));
             if (updated.get()) {
                 previousValue.set(existing);