testing: Use renamed systemd unit

While the alias is available after enabling the unit, we don't
actually do that in our testing environment (adding a symlink manually
would work too, then again, why not just use the proper name?).

testing/tests/sql/rw-psk-rsa-split/posttest.dat

@@ -1,8 +1,8 @@
 carol::swanctl --terminate --ike home
 dave::swanctl --terminate --ike home
-carol::systemctl stop strongswan-swanctl
-dave::systemctl stop strongswan-swanctl
-moon::systemctl stop strongswan-swanctl
+carol::systemctl stop strongswan
+dave::systemctl stop strongswan
+moon::systemctl stop strongswan
 moon::iptables-restore < /etc/iptables.flush
 carol::iptables-restore < /etc/iptables.flush
 dave::iptables-restore < /etc/iptables.flush

testing/tests/sql/rw-psk-rsa-split/pretest.dat

@@ -10,9 +10,9 @@ moon::cd /etc/swanctl; rm -r rsa/* x509/* x509ca/*
 moon::iptables-restore < /etc/iptables.rules
 carol::iptables-restore < /etc/iptables.rules
 dave::iptables-restore < /etc/iptables.rules
-moon::systemctl start strongswan-swanctl
-carol::systemctl start strongswan-swanctl
-dave::systemctl start strongswan-swanctl
+moon::systemctl start strongswan
+carol::systemctl start strongswan
+dave::systemctl start strongswan
 moon::expect-connection rw
 carol::expect-connection home
 carol::swanctl --initiate --child home 2> /dev/null