[dts] [PATCH] tests/tx_preparation: auto-detect tcpdump parameter format

[Liu, Yong]

Thanks Herbert. Applied.

On 08/04/2017 03:02 PM, Herbert Guan wrote:
> tcpdump is expect -P or -Q on different versions.
> Use script to detect the expected option format automatically
> to satisfy all versions of tcpdump.
>
> Signed-off-by: Herbert Guan<herbert.guan at arm.com>