This emulates two clients behind the same NAT.

road imports north's identity as well. It establishes road
using certificates. then kills pluto hard and established
north. This fails on east with:

"road-eastnet-ikev2"[1] 192.1.2.254 #3: Signature check (on C=ca, ST=Ontario, O=Libreswan, OU=Test Department, CN=road.testing.libreswan.org, E=testing@libreswan.org) failed (wrong key?); tried *AwEAAdrh2

