[pylint] fix pylint detected errors and tweak it so that pylint -E will be much less verbose next time (+ update some copyrights on the way)

#! /bin/sh -e

if [ -x "/etc/init.d/cubicweb-ctl" ]; then
    invoke-rc.d cubicweb-ctl restart || true
fi
 
 
#DEBHELPER#
 
exit 0