[session] make security_enabled API private
The doc already says "internal API". The old entry point is now officially
deprecated and the context manager have been made private.
#! /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