app/testpmd: fix Tx QinQ set
app/testpmd: fix Tx QinQ set

Enable DEV_TX_OFFLOAD_VLAN_INSERT also along with
DEV_TX_OFFLOAD_VLAN_QINQ in tx_qinq_set() as it takes
both vlan id's as arguments.

Fixes: 597f9fafe13b ("app/testpmd: convert to new Tx offloads API")
Cc: stable@dpdk.org

Signed-off-by: Nithin Dabilpuram <5876e1d9ac41f57357c508f9123b8d030ff3606b@marvell.com>
Acked-by: Bernard Iremonger <233eeff376ad0c06f66f06c5522ea3c4feb30d3b@intel.com>
Reviewed-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk