testing: Add expect-connection calls for all tests and hosts

There are some exceptions (e.g. those that use auto=start or p2pnat).

testing/tests/ikev2/host2host-cert/pretest.dat

@@ -2,6 +2,6 @@ moon::iptables-restore < /etc/iptables.rules
 sun::iptables-restore < /etc/iptables.rules
 sun::ipsec start
 moon::ipsec start
-sun::expect-connnection host-host
+sun::expect-connection host-host
 moon::expect-connection host-host
 moon::ipsec up host-host