[transaction] initialize security control attribute in Transaction
There is no reason to not initialize them in __init__ time. This simplify the
Session code.
#! /bin/sh -ecase "$1" in remove) if [ -x "/etc/init.d/cubicweb-ctl" ]; then invoke-rc.d cubicweb-ctl stop || true fi ;;esac#DEBHELPER#exit 0