testing: Add an IKEv2 net2net AH test case

testing/tests/ikev2/net2net-ah/hosts/moon/etc/ipsec.conf

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+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+	charondebug="cfg 2, knl 2"
+
+conn %default
+	keyexchange=ikev2
+	ike=aes128-sha1-modp1536!
+	ah=sha1-md5
+
+conn net-net
+	left=PH_IP_MOON
+	leftcert=moonCert.pem
+	leftid=@moon.strongswan.org
+	leftsubnet=10.1.0.0/16
+	leftfirewall=yes
+	right=PH_IP_SUN
+	rightid=@sun.strongswan.org
+	rightsubnet=10.2.0.0/16
+	auto=add

testing/tests/ikev2/net2net-ah/hosts/moon/etc/strongswan.conf

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+# /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
+}

testing/tests/ikev2/net2net-ah/hosts/sun/etc/ipsec.conf

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+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+	charondebug="cfg 2, knl 2"
+
+conn %default
+	keyexchange=ikev2
+	ike=aes128-sha1-modp1536!
+	ah=sha1!
+
+conn net-net
+	left=PH_IP_SUN
+	leftcert=sunCert.pem
+	leftid=@sun.strongswan.org
+	leftsubnet=10.2.0.0/16
+	leftfirewall=yes
+	right=PH_IP_MOON
+	rightid=@moon.strongswan.org
+	rightsubnet=10.1.0.0/16
+	auto=add

testing/tests/ikev2/net2net-ah/hosts/sun/etc/strongswan.conf

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+# /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
+}