[LTP] How about set IPsec with ip xfrm?

[Hangbin Liu]

Hi Cyril and Alexey,

Msst of the network stress tests have IPsec testing, and
we use setkey for configuration. But setkey[1] hasn't updated
for a long time. And some distros, RHEL7 for example, even
don't have ipset-tools package. So how about rewrite IPsec
config with ip xfrm? or at least make both method works?

[1] http://ipsec-tools.sourceforge.net/

Thanks
Hangbin Liu