[oe] [meta-networking][PATCHv2] tcpdump, tcpreplay:relocate tcpdump and add tcpreplay recipe

[Zongchun YU]

>Can you update the packagegroup in meta-oe which depends on tcpdump?
>PACKAGECONFIG or just dropping tcpdump from it is fine with me.

Martin, please see the last parts of the patch. I have dropped tcpdump in
the packagegroup recipe And it is fine with me too.