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-stroke/ip-pool/description.txt

@@ -0,0 +1,11 @@
+The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each to gateway <b>moon</b>.
+Both <b>carol</b> and <b>dave</b> request a <b>virtual IP</b> via the IKEv2 configuration payload
+by using the <b>leftsourceip=%config</b> parameter. <b>moon</b> assigns virtual IP addresses
+from a simple pool defined by <b>rightsourceip=10.3.0.0/28</b> in a monotonously
+increasing order.
+<p/>
+Upon the successful establishment of the IPsec tunnel, <b>leftfirewall=yes</b> automatically
+inserts iptables-based firewall rules that let pass the tunneled traffic. In order to test the
+tunnels, <b>carol</b> and <b>dave</b> then ping the client <b>alice</b> behind the gateway
+<b>moon</b>. The source IP addresses of the two pings will be the virtual IPs <b>10.3.0.1</b>
+and <b>10.3.0.2</b>, respectively.