Same as nat-pluto-03 but for IKEv2.

This test has a road warrior, ("road") connecting to VPN host east.

It shows up from a random IP.

Road has encapsulation=yes, so even though there is no NAT happening, we
should still do a NAT-T ESPinUDP encaps connection to east.

East has a default config, with an implicit encapsulation=auto
