[dts] [PATCH V6] tests/virtio_smoke:add virtio smoke test suite sync with test plan

[Tu, Lijuan]

> v1:
> Add virtio smoke test suite sync with test plan.
> 
> v2:
> 1.Modiry Copyrint(c)<2019> to Copyrint(c)<2021>.
> 2.Fix CentOS check hugepagesize return ' 2048' dts issue.
> 3.Add test case run exception handing 'kill dpdk-testpmd'
>   in set_up and tear_down.
> 
> v3:
> Modify patch subject and comments description error.
> 
> v4:
> Modify set_up method,kill testpmd then remove vhost-net*.
> 
> v5:
> Fix patch spelling error.
> 
> v6:
> Fix patch spelling error.
> 
> Signed-off-by: Ling Wei <weix.ling at intel.com>

Applied.