Use attest database in tnc/tnccs-20-os scenario

testing/tests/tnc/tnccs-20-os/posttest.dat

@@ -5,3 +5,4 @@ moon::iptables-restore < /etc/iptables.flush
 carol::iptables-restore < /etc/iptables.flush
 dave::iptables-restore < /etc/iptables.flush
 carol::echo 1 > /proc/sys/net/ipv4/ip_forward
+moon::rm /etc/pts/config.db