Add requirements.txt files in test directories
These files, located in each test directory (when needed), list test
dependencies supplementary to install requirements.
Some requirements.txt files include psycopg2 because it won't get installed by
logilab-database apparently.
Related to #5447161.
#!/bin/sh -e
if [ "$1" = "purge" ] ; then
update-rc.d cubicweb remove >/dev/null
fi
#DEBHELPER#
exit 0