[dts] [PATCH] tests/userspace_ethtool: fix link down verify failure destroyed ports link

[Liu, Yong]

Thanks, Phil. Applied.

On 06/15/2018 04:58 PM, dts-bounces at dpdk.org wrote:
> Test Case test_dump_driver_info will set ip link down to get the port
> link down status. If verification is failed, it won't setup the
> port link in the subsequent test.
>
> Add record for this verification and raise exception for the verify
> failure to restore the link.
>
> Signed-off-by: Phil Yang<phil.yang at arm.com>
> ---