testing: Add an IKEv2 host2host AH transport mode test case

testing/tests/ikev2/host2host-ah/hosts/sun/etc/ipsec.conf

@@ -0,0 +1,17 @@
+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+
+conn %default
+	keyexchange=ikev2
+
+conn host-host
+	left=PH_IP_SUN
+	leftcert=sunCert.pem
+	leftid=@sun.strongswan.org
+	leftfirewall=yes
+	right=PH_IP_MOON
+	rightid=@moon.strongswan.org
+	type=transport
+	ah=aesxcbc
+	auto=add

testing/tests/ikev2/host2host-ah/hosts/sun/etc/strongswan.conf

@@ -0,0 +1,6 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+charon {
+  load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 revocation hmac xcbc stroke kernel-netlink socket-default updown
+  multiple_authentication = no
+}