selftests/bpf: Verify xdp_metadata xdp->af_xdp path

- create new netns
- create veth pair (veTX+veRX)
- setup AF_XDP socket for both interfaces
- attach bpf to veRX
- send packet via veTX
- verify the packet has expected metadata at veRX

Cc: John Fastabend <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: Willem de Bruijn <[email protected]>
Cc: Jesper Dangaard Brouer <[email protected]>
Cc: Anatoly Burakov <[email protected]>
Cc: Alexander Lobakin <[email protected]>
Cc: Magnus Karlsson <[email protected]>
Cc: Maryam Tahhan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Stanislav Fomichev <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin KaFai Lau <[email protected]>

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