[devtools/qunit] Turn FirefoxHelper into a context manager
So that stop() method always gets called.
Also ensure temporary directory created on __init__ gets deleted as well upon
exit.
#!/bin/sh -e
if [ "$1" = "remove" ]; then
update-rc.d cubicweb remove >/dev/null
fi
if [ "$1" = "purge" ] ; then
rm -rf /etc/cubicweb.d/
rm -rf /var/log/cubicweb/
rm -rf /var/lib/cubicweb/
fi
#DEBHELPER#
exit 0