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

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

@@ -1,5 +1,5 @@
 moon::ipsec stop
 carol::ipsec stop
-alice::killall radiusd
+alice::killall freeradius
 moon::iptables-restore < /etc/iptables.flush
 carol::iptables-restore < /etc/iptables.flush

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

@@ -1,6 +1,6 @@
 moon::iptables-restore < /etc/iptables.rules
 carol::iptables-restore < /etc/iptables.rules
-alice::radiusd
+alice::freeradius
 moon::ipsec start
 carol::ipsec start
 moon::expect-connection rw-eap