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/inactivity-timeout/pretest.dat

@@ -1,5 +1,6 @@
 carol::iptables-restore < /etc/iptables.rules
 moon::ipsec start
 carol::ipsec start
+moon::expect-connection rw
 carol::expect-connection home
 carol::ipsec up home