[dts] [PATCH V1] tests/vm2vm_virtio_net_perf:Add and modify testcase sync with testplan

[Tu, Lijuan]

> 1.Modify testcase 8 sync with testplan.
> 2.Add testcase 12 sync with testplan.
> 3.Add bind dut ports to DPDK-compatible driver method and
>   step in tear_down_all to restore testbed.
> 4.Adjust code format.
> 
> Signed-off-by: Ling Wei <weix.ling at intel.com>

Applied