testing: Add a test scenario for make-before-break reauth using a virtual IP

testing/tests/ikev2/reauth-mbb-virtual-ip/hosts/carol/etc/ipsec.conf

@@ -0,0 +1,22 @@
+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+
+conn %default
+	keylife=20m
+	ikelifetime=10s
+	rekeymargin=5s
+	rekeyfuzz=0%
+	keyingtries=1
+
+conn home
+	left=PH_IP_CAROL
+	leftcert=carolCert.pem
+	leftid=carol@strongswan.org
+	leftsourceip=%config
+	leftfirewall=yes
+	right=PH_IP_MOON
+	rightid=@moon.strongswan.org
+	rightsubnet=10.1.0.0/16
+	keyexchange=ikev2
+	auto=add

testing/tests/ikev2/reauth-mbb-virtual-ip/hosts/carol/etc/strongswan.conf

@@ -0,0 +1,7 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+charon {
+  load = aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 curl revocation hmac xcbc stroke kernel-netlink socket-default updown
+
+  make_before_break = yes
+}