* Enqueue request to delete short flow from flow stats collector

All flow table delete and add operation happens in FlowTable context
in case of short flow were getting deleted directly resulting in
flow table getting modified in multiple context. Correcting the same.
Closes-bug:#1515260

Change-Id: I8a69266d8f2f44c1036c809dd2284be0343c8f7c

src/vnsw/agent/vrouter/flow_stats/flow_stats_collector.cc

@@ -716,8 +716,7 @@ bool FlowStatsCollector::Run() {
                     it++;
                 }
             }
-            Agent::GetInstance()->pkt()->flow_table()->Delete
-                (entry->key(), true);
+            Agent::GetInstance()->pkt()->flow_table()->DeleteEnqueue(entry);
             entry = NULL;
             if (reverse_flow) {
                 count++;