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/pfkey/net2net-route/pretest.dat

@@ -2,5 +2,6 @@ moon::iptables-restore < /etc/iptables.rules
 sun::iptables-restore < /etc/iptables.rules
 moon::ipsec start
 sun::ipsec start
+sun::expect-connection net-net
 moon::expect-connection net-net
 alice::ping -c 3 -W 1 -i 0.2 PH_IP_BOB