selftests/net: so_txtime multi-host support

SO_TXTIME hardware offload requires testing across devices, either
between machines or separate network namespaces.

Split up SO_TXTIME test into tx and rx modes, so traffic can be
sent from one process to another. Create a veth-pair on different
namespaces and bind each process to an end point via [-S]ource and
[-D]estination parameters. Optional start [-t]ime parameter can be
passed to synchronize the test across the hosts (with synchorinzed
clocks).

Signed-off-by: Carlos Llamas <[email protected]>
Reviewed-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Carlos Llamas