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/any-interface/pretest.dat

@@ -4,6 +4,8 @@ alice::ipsec start
 moon::ipsec start
 sun::ipsec start
 bob::ipsec start
+alice::expect-connection remote
+sun::expect-connection remote
 moon::expect-connection alice
 moon::ping -n -c 3 -W 1 -i 0.2 -s 8184 -p deadbeef PH_IP_ALICE
 moon::ping -n -c 3 -W 1 -i 0.2 -s 8184 -p deadbeef PH_IP_SUN