[devtools] fix a couple issues with xvfb-run
xvfb-run didn't quite clean up correctly after itself, because:
- dash doesn't run EXIT traps on signals
- if we don't run the command in the background, a TERM handler doesn't run
until the command exits
#! /bin/sh -e
if [ -x "/etc/init.d/cubicweb-ctl" ]; then
invoke-rc.d cubicweb-ctl restart || true
fi
#DEBHELPER#
exit 0