[dts] [PATCH V2] tests/pvp_virtio_user_multi_queues_port_restart: Add one new case and Optimize script

[Tu, Lijuan]

> 1,Add one new case:packed_ring_vectorized_path which need enable avx512
> 2,Optimize testpmd function and Modify TC7&TC8 script to adapt testplan
> 
> Signed-off-by: JiangYu <yux.jiang at intel.com>

Applied