Added WITHDRAW_REQ Intent State for ONOS-146

Fixed flow removed from other instance

Change-Id: I22c88a447e26770fea8b7e23f4a78b1389077ad1
diff --git a/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleLeadershipManager.java b/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleLeadershipManager.java
index b10ac60..cf3c043 100644
--- a/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleLeadershipManager.java
+++ b/core/store/trivial/src/main/java/org/onlab/onos/store/trivial/impl/SimpleLeadershipManager.java
@@ -59,6 +59,7 @@
 
     @Override
     public Map<String, Leadership> getLeaderBoard() {
+        //FIXME
         throw new UnsupportedOperationException("I don't know what to do." +
                                                         " I wish you luck.");
     }