Reduce log level for frequent leadership event log

Change-Id: Ie074588a516f160de92ba8ee9a51d7b9fbcfe43d
diff --git a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DistributedLeadershipManager.java b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DistributedLeadershipManager.java
index bc12374..5e5fa06 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DistributedLeadershipManager.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DistributedLeadershipManager.java
@@ -304,7 +304,7 @@
             LeadershipEvent leadershipEvent =
                     SERIALIZER.decode(message.payload());
 
-            log.debug("Leadership Event: time = {} type = {} event = {}",
+            log.trace("Leadership Event: time = {} type = {} event = {}",
                     leadershipEvent.time(), leadershipEvent.type(),
                     leadershipEvent);