Fix IntentPartition rebalance to work correctly after a network partition heals

Change-Id: Ie73598bc191fffb46d18fc3544f9d2b15d10feb7

@@ -179,6 +179,14 @@ public class IntentPartitionManager implements IntentPartitionService {
 
         int myShare = (int) Math.ceil((double) NUM_PARTITIONS / activeNodes);
 
+        // First make sure this node is a candidate for all partitions.
+        IntStream.range(0, NUM_PARTITIONS)
+                 .mapToObj(this::getPartitionPath)
+                 .map(leadershipService::getLeadership)
+                 .filter(leadership -> !leadership.candidates().contains(localNodeId))
+                 .map(Leadership::topic)
+                 .forEach(leadershipService::runForLeadership);
+
         List<String> myPartitions = IntStream.range(0, NUM_PARTITIONS)
                                              .mapToObj(this::getPartitionPath)
                                              .map(leadershipService::getLeadership)
@@ -189,6 +197,7 @@ public class IntentPartitionManager implements IntentPartitionService {
 
         int relinquish = myPartitions.size() - myShare;
 
+
         for (int i = 0; i < relinquish; i++) {
             String topic = myPartitions.get(i);
             leadershipService.withdraw(topic);