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/reauth-mbb-revoked/description.txt

@@ -1,15 +0,0 @@
-This scenario tests <b>make-before-break reauthentication</b> using overlapping
-IKE_SAs by setting the <i>make_before_break</i> strongswan.conf option. The
-initiator <b>carol</b> reauthenticates the IKE_SA with host <b>moon</b> using
-<b>ikelifetime=10s</b>, but does not close the old IKE_SA before the replacement
-CHILD_SA is in place. A constant ping from <b>carol</b> to client <b>alice</b>
-hiding in the subnet behind <b>moon</b> tests if the CHILD_SA works during the
-whole procedure.
-<p/>
-Because the responder is always able to install CHILD_SAs before the initiator
-is, some traffic sent by the responder over such a CHILD_SA might get dropped by
-the initiator (until it also installed the CHILD_SA).  This is particularly
-problematic if OCSP/CRL checks are delayed or if they can also be done via the
-IPsec tunnel once it's established.  Therefore, online OCSP/CRL checks are
-suspended during the reauthentication and done afterwards. This is verified here
-by revoking the responder's certificate after the SA got initially established.