This test is to ensure that pluto handles an unsupported cert (ECDSA)
gracefully. charon on west sends east pluto the cert for auth. pluto
responds with:

"westnet-eastnet-ikev1-eccert" #1: Pluto does not support OAKLEY_ECDSA_P384 authentication.  Attribute OAKLEY_AUTHENTICATION_METHOD
"westnet-eastnet-ikev1-eccert" #1: no acceptable Oakley Transform
"westnet-eastnet-ikev1-eccert" #1: sending notification NO_PROPOSAL_CHOSEN to 192.1.2.45:500