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/ip-two-pools-v4v6/description.txt

@@ -1,5 +0,0 @@
-The host <b>carol</b> sets up a tunnel connection to gateway <b>moon</b>. It requests
-both an IPv4 and an IPv6 <b>virtual IP</b> via the IKEv2 configuration payload by using
-<b>leftsourceip=%config4,%config6</b>. Gateway <b>moon</b> assigns virtual IPs addresses
-from two in-memory pools using the <b>rightsourceip</b> option. The established tunnel
-carries both IPv4 and IPv6 in an IPv4 encapsulated tunnel.