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/ip-split-pools-db/posttest.dat

@@ -1,5 +1,5 @@
 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

testing/tests/sql/ip-split-pools-db/pretest.dat

@@ -8,9 +8,9 @@ moon::ipsec pool --status 2> /dev/null
 carol::cd /etc/swanctl; rm -r rsa/* x509/* x509ca/*
 dave::cd /etc/swanctl; rm -r rsa/* x509/* x509ca/*
 moon::cd /etc/swanctl; rm -r rsa/* x509/* x509ca/*
-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