app/testpmd: fix Tx VLAN and QinQ dependency
app/testpmd: fix Tx VLAN and QinQ dependency

Tx VLAN & QinQ insert enable need not depend on
Rx VLAN offload ETH_VLAN_EXTEND_OFFLOAD. For Tx VLAN
insert enable, error check is now to see if QinQ was enabled
but only single VLAN id is set.

Fixes: 6a34f91690d0 ("app/testpmd: fix error message when setting Tx VLAN")
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