Dpdk link failover not working.

closes-jira-bug: CEM-7346
Issue in the dpdk bond driver. When the number of slaves
becomes less than 2, the driver doesnt send out the packet
with regular tx function. The issue is not present in the
fast tx function of the driver.

Change-Id: Ifb41561587648f10388dc78fbf54cdc37e2b3733

drivers/net/bonding/rte_eth_bond_pmd.c

@@ -1321,7 +1321,7 @@ bond_ethdev_tx_burst_8023ad(void *queue, struct rte_mbuf **bufs,
 					slave_port_ids[i];
 	}
 
-	if (likely(dist_slave_count > 1)) {
+	if (likely(dist_slave_count > 0)) {
 
 		/*
 		 * Populate slaves mbuf with the packets which are to be sent