Refresh pipeleiner cache with newly initialized Pipeliner

Change-Id: I149b450a6698fd0b0f4af719396fef83f8140549

@@ -304,7 +304,7 @@ public class FlowObjectiveManager implements FlowObjectiveService {
         Pipeliner pipeliner = handler.behaviour(Pipeliner.class);
         Pipeliner pipeliner = handler.behaviour(Pipeliner.class);
         hbTime = now();
         hbTime = now();
         pipeliner.init(deviceId, context);
         pipeliner.init(deviceId, context);
-        pipeliners.putIfAbsent(deviceId, pipeliner);
+        pipeliners.put(deviceId, pipeliner);
     }
     }
 
 
     // Triggers driver setup when the local node becomes a device master.
     // Triggers driver setup when the local node becomes a device master.