[He plugin] Reconciliation not triggering after a single node reboot in a nonOFHA scenario

Reconciliation is not getting triggered after reboot of node to which the switch was connected. In a non-OFHA scenario, if the node goes does down along with th eswitch, the OperDS still has the stale entity. Now, when switch reconnects to the same cluster-node or different cluster-node, even if we try to update Oper DS, DataTreeChange notification is not fired (because we are updating same switch infor again) and hence reconciliation would not trigger.