ONOS-4656 Addressing issue where intents get stuck in PURGE_REQ state.

Change-Id: I223ff14856fadb8d6e913883b42a5e53bbbbc6db

@@ -177,9 +177,13 @@ public class GossipIntentStore
         if (IntentData.isUpdateAcceptable(currentData, newData)) {
         if (IntentData.isUpdateAcceptable(currentData, newData)) {
             // Only the master is modifying the current state. Therefore assume
             // Only the master is modifying the current state. Therefore assume
             // this always succeeds
             // this always succeeds
-            if (newData.state() == PURGE_REQ && currentData != null) {
+            if (newData.state() == PURGE_REQ) {
+                if (currentData != null) {
                     currentMap.remove(newData.key(), currentData);
                     currentMap.remove(newData.key(), currentData);
                 } else {
                 } else {
+                    log.info("Gratuitous purge request for intent: {}", newData.key());
+                }
+            } else {
                 currentMap.put(newData.key(), new IntentData(newData));
                 currentMap.put(newData.key(), new IntentData(newData));
             }
             }