testing: Migrated p2pnat/behind-same-nat scenario to vici

testing/tests/p2pnat/behind-same-nat/posttest.dat

@@ -1,6 +1,6 @@
-venus::ipsec stop
-alice::ipsec stop
-carol::ipsec stop
+venus::systemctl stop strongswan
+alice::systemctl stop strongswan
+carol::systemctl stop strongswan
 alice::iptables-restore < /etc/iptables.flush
 carol::iptables-restore < /etc/iptables.flush
 venus::iptables-restore < /etc/iptables.flush