testing: Use freeradius instead of the removed radiusd to start FreeRADIUS

testing/tests/ikev2/rw-eap-ttls-radius/posttest.dat

@@ -1,7 +1,7 @@
 moon::ipsec stop
 carol::ipsec stop
 dave::ipsec stop
-alice::killall radiusd
+alice::killall freeradius
 moon::iptables-restore < /etc/iptables.flush
 carol::iptables-restore < /etc/iptables.flush
 dave::iptables-restore < /etc/iptables.flush

testing/tests/ikev2/rw-eap-ttls-radius/pretest.dat

@@ -1,7 +1,7 @@
 moon::iptables-restore < /etc/iptables.rules
 carol::iptables-restore < /etc/iptables.rules
 dave::iptables-restore < /etc/iptables.rules
-alice::radiusd
+alice::freeradius
 moon::ipsec start
 carol::ipsec start
 dave::ipsec start