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/crl-from-cache/pretest.dat

@@ -4,5 +4,6 @@ carol::wget -q http://crl.strongswan.org/strongswan.crl
 carol::mv strongswan.crl /etc/ipsec.d/crls/5da7dd700651327ee7b66db3b5e5e060ea2e4def.crl
 moon::ipsec start
 carol::ipsec start
+moon::expect-connection rw
 carol::expect-connection home
 carol::ipsec up home