[debian] Update description of cubicweb-ctl* packages init scripts are no longer shipped. Avoid mentionning "start" and "stop" command which should not be used in production environments.

version=3
opts=uversionmangle=s/(rc|a|b|c)/~$1/ \
https://pypi.debian.net/cubicweb/cubicweb-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))