testing: Add pfkey/shunt-policies-nat-rw scenario

testing/tests/pfkey/shunt-policies-nat-rw/hosts/alice/etc/ipsec.conf

@@ -0,0 +1,27 @@
+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+
+conn %default
+	ikelifetime=60m
+	keylife=20m
+	rekeymargin=3m
+	keyingtries=1
+	keyexchange=ikev2
+
+conn nat-t
+	left=%any
+	leftcert=aliceCert.pem
+	leftid=alice@strongswan.org
+	leftsourceip=%config
+	right=PH_IP_SUN
+	rightid=@sun.strongswan.org
+	rightsubnet=0.0.0.0/0
+	auto=add
+
+conn local-net
+	leftsubnet=10.1.0.0/16
+	rightsubnet=10.1.0.0/16
+	authby=never
+	type=pass
+	auto=route

testing/tests/pfkey/shunt-policies-nat-rw/hosts/alice/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 stroke kernel-pfkey kernel-netlink socket-default updown
+
+  keep_alive = 5
+}