[dts] [PATCH] tests/short_live: fixes the result parsing issue

[Liu, Yong]

Thanks Herbert. Some comments below.

On 08/04/2017 03:18 PM, Herbert Guan wrote:
> Fixes below issues:
> 1) corrected the scapy reslut parsing string
> 2) ensure link up for testpmd and l3fwd
Suggest to waiting for LSC event or just wait some seconds for link 
status updated.

> 3) pkill for l2fwd and l3fwd need to wait a while for process quit
L2fwd and L3fwd will do the same actions after received SIGINT or 
SIGTERM signal. There's no need to change the signal type.

> Signed-off-by: Herbert Guan<herbert.guan at arm.com>