[dts] [PATCH V3]test_plans: add test plan for cvl supporting qinq protocol

[Tu, Lijuan]

> dpdk can support qinq in CVL from dpdk-21.02,
> add test plan to cover 3 parts:
> 1. DCF switch filter for QinQ.
> 2. DCF pvid support for QinQ.
> 3. AVF VLAN offload for QinQ.
> 
> Signed-off-by: qifu <qi.fu at intel.com>

Applied, thanks