Basic pluto test, except the policy has been adjusted to permit only
cast128 for for phase 2 via KLIPS CryptoAPI

minor buglet, ipsec look shows:

esp0xSPISPI@192.1.2.23 ESP_ID6_HMAC_SHA1: dir=out src=192.1.2.45 iv_bits=64bits iv=0xIVISFORRANDOM000 ooowin=64  alen=160 aklen=160 e

and shows ESP_ID6 instead of ESP_CAST