testing: Remove nearly all sleep calls from pretest and posttest scripts

By consistently using the `expect-connection` helper we can avoid pretty
much all previously needed calls to sleep.

testing/tests/ikev2/dpd-restart/evaltest.dat

@@ -8,6 +8,6 @@ carol::cat /var/log/daemon.log::retransmit.*of request::YES
 carol::cat /var/log/daemon.log::giving up after.*retransmits::YES
 carol::iptables -D INPUT -i eth0 -s PH_IP_MOON -j DROP::no output expected::NO
 moon:: iptables -D INPUT -i eth0 -s PH_IP_CAROL -j DROP::no output expected::NO
-carol::sleep 1::no output expected::NO
+carol::sleep 2::no output expected::NO
 carol::ipsec status 2> /dev/null::home.*INSTALLED, TUNNEL::YES
 moon:: ipsec status 2> /dev/null::rw.*INSTALLED, TUNNEL::YES

testing/tests/ikev2/dpd-restart/pretest.dat

@@ -1,4 +1,4 @@
 moon::ipsec start
 carol::ipsec start
-carol::sleep 2 
+carol::expect-connection home
 carol::ipsec up home