testing: wait until connections are loaded

testing/tests/ikev2/dhcp-dynamic/posttest.dat

@@ -2,7 +2,7 @@ moon::ipsec stop
 carol::ipsec stop
 dave::ipsec stop
 venus::cat /var/state/dhcp/dhcpd.leases
-venus::/etc/init.d/isc-dhcp-server stop 2> /dev/null
+venus::service isc-dhcp-server stop 2> /dev/null
 moon::iptables-restore < /etc/iptables.flush
 carol::iptables-restore < /etc/iptables.flush
 dave::iptables-restore < /etc/iptables.flush