[devtools] Use XMLValidator instead deprecated SaxOnlyValidator
The renaming was introduced in 198fdadafed6.o
This prevent a meta class conflict introduced by logilab-common 0fcd2e050621.
#! /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