testing: Add per-CPU SA test scenario

testing/tests/ikev2/per-cpu-sas/pretest.dat

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+sun::iptables-restore < /etc/iptables.rules
+moon::iptables-restore < /etc/iptables.rules
+sun::systemctl start strongswan
+moon::systemctl start strongswan
+sun::expect-connection gw-gw
+moon::expect-connection gw-gw
+# triggering packet apparently goes via lo
+moon::iptables -A OUTPUT -o lo -d 10.2.0.0/16 -j ACCEPT
+# trigger the creation of the fallback SA, use -I so no UDP socket is used to
+# determine the source address and trigger the acqurie (this packet is lost)
+moon::ping -c 1 -W 1 -I PH_IP_MOON1 PH_IP_BOB