testing: Make TNC scenarios agnostic to the actual Debian version

The scenarios will work with new or old base images as long as the version
in use is included as product in the master data (src/libimcv/imv/data.sql).

testing/tests/tnc/tnccs-20-pdp-eap/pretest.dat

@@ -7,6 +7,7 @@ dave::cat /etc/tnc_config
 carol::echo 0 > /proc/sys/net/ipv4/ip_forward
 dave::echo aabbccddeeff11223344556677889900 > /var/lib/dbus/machine-id
 alice::sed -i "s/NOW/`date +%s`/g" /etc/pts/data1.sql
+alice::sed -i "s:DEBIAN_VERSION:\`cat /etc/debian_version\`:" /etc/pts/data1.sql
 alice::cd /usr/local/share/strongswan/templates/database/imv; cat tables.sql data.sql /etc/pts/data1.sql | sqlite3 /etc/pts/config.db
 alice::chgrp www-data /etc/pts/config.db; chmod g+w /etc/pts/config.db
 alice::/var/www/tnc/manage.py setpassword strongSwan strongSwan