[server/session] remove json dumps around call_service This backouts changeset b151beea9cb6. With call_service being in-process and synchronous, there's no RPC use case.

#! /bin/sh -e
 
case "$1" in
    remove)
	if [ -x "/etc/init.d/cubicweb-ctl" ]; then
	    invoke-rc.d cubicweb-ctl stop || true
	fi
    ;;
esac
 
#DEBHELPER#
 
exit 0