testing: Install a package via apt-get to get a second SWIMA software event

This installs tmux and its two dependencies libevent-2.0-5 and libutempter0.
For the tnc/tnccs-20-ev-pt-tls test scenario older, apparently replaced
versions of these packages are entered to the collector.db database, so that
dummy SWID tags for these packages can be requested via SWIMA.

testing/hosts/default/usr/local/bin/init_collector

@@ -1,4 +1,6 @@
 #! /bin/sh
 
 cat /usr/local/share/strongswan/templates/database/sw-collector/sw_collector_tables.sql | sqlite3 /etc/db.d/collector.db
+sed -i "s:DEBIAN_VERSION:`cat /etc/debian_version`:" /etc/pts/collector.sql
+cat /etc/pts/collector.sql | sqlite3 /etc/db.d/collector.db
 LEAK_DETECTIVE_DISABLE=1 /usr/local/sbin/sw-collector