[dts] [PATCH] tests/short_live: fix issues in wating for link status up

[Liu, Yong]

Thanks Herbert. Applied. By now waiting few seconds for link stability 
is the most appropriate way for different kinds of NICs.

On 08/07/2017 05:57 PM, Herbert Guan wrote:
> fixes: 78212a000d  ("tests/short_live: fixes the result parsing issue")
> For fiber links, no "LSC event" is expected.  So "testpmd>" is the
> correct string to check.
> Change to use sleep(5) for non-fiber links to wait for the links up.
>
> Signed-off-by: Herbert Guan<herbert.guan at arm.com>