testing: Migrate MOBIKE tests to vici

Note that the mobike-nat test has been removed as it basically did the same
as the mobike-virtual-ip-nat test.  Instead, the mobike-nat-mapping scenario
is added, which simulates a NAT router restart.

testing/tests/ikev2/mobike/hosts/sun/etc/swanctl/swanctl.conf

@@ -0,0 +1,22 @@
+connections {
+
+   mobike {
+      local_addrs  = PH_IP_SUN
+      remote_addrs = 192.168.0.50
+
+      local {
+         auth = pubkey
+         certs = sunCert.pem
+         id = sun.strongswan.org
+      }
+      remote {
+         auth = pubkey
+         id = alice@strongswan.org
+      }
+      children {
+         mobike {
+            local_ts = 10.2.0.0/16
+         }
+      }
+   }
+}