testing: Reorganizing IKEv1 and IKEv2 examples

For documentation purposes the new folders ikev1-algs, ikev2-algs,
ikev1-multi-ca and ikev2-multi-ca have been created. Most of the
test cases have now been converted to the vici interface. The
remaining legacy stroke scenarios yet to be converted have been put
into the ikev2-stroke-bye folder.

For documentation purposes some legacy stroke scenarios will be kept
in the ikev1-stroke, ikev2-stroke and ipv6-stroke folders.

testing/tests/ikev2/two-certs/pretest.dat

@@ -1,10 +1,7 @@
-moon::iptables-restore < /etc/iptables.rules
-carol::iptables-restore < /etc/iptables.rules
-moon::ipsec start
-carol::ipsec start
-moon::expect-connection alice
-moon::expect-connection venus
+moon::systemctl start strongswan
+carol::systemctl start strongswan
+moon::expect-connection rw
 carol::expect-connection alice
+carol::swanctl --initiate --child alice 2> /dev/null
 carol::expect-connection venus
-carol::ipsec up alice
-carol::ipsec up venus
+carol::swanctl --initiate --child venus 2> /dev/null