testing: Migrate ikev2-stroke-bye scenarios to vici

testing/tests/ikev2/rw-psk-no-idr/description.txt

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+The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each
+to gateway <b>moon</b>. The authentication is based on distinct <b>pre-shared keys</b>
+and fully qualified domain names. By setting the wildcard <b>remote.id=@*.strongswan.org</b>
+on <b>carol</b> and <b>dave</b>, no <b>IDr</b> payloads are sent by the roadwarriors.
+<p/>
+Upon the successful establishment of the IPsec tunnels, the updown-script automatically
+inserts iptables-based firewall rules that let pass the tunneled traffic.
+In order to test both tunnel and firewall, both <b>carol</b> and <b>dave</b> ping the
+client <b>alice</b> behind the gateway <b>moon</b>.