Use ConsistentMap (and not the local cache) when querying leader for a topic

Change-Id: I979a4ab116ed68406a6702fe175ba5eab444116c
diff --git a/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/DistributedLeadershipStore.java b/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/DistributedLeadershipStore.java
index 83d6f96..78ccc47 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/DistributedLeadershipStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/cluster/impl/DistributedLeadershipStore.java
@@ -219,7 +219,7 @@
 
     @Override
     public Leadership getLeadership(String topic) {
-        InternalLeadership internalLeadership = Versioned.valueOrNull(leadershipCache.get(topic));
+        InternalLeadership internalLeadership = Versioned.valueOrNull(leadershipMap.get(topic));
         return internalLeadership == null ? null : internalLeadership.asLeadership();
     }