RFC 7427:
Basic pluto with IKEv2 using X.509 on the initiator (west), and Strongswan on
the responder (east).

This is the reverse test of interop-ikev2-strongswan-05

By default the Authentication method now is Digital Signatures.
We currently support RSA-SHA2 and its variants.

Authentication should be successful with rsa-sha2 (rsa-sh2_256)

