[native] Use cnx.system_sql instead of doexec method in syntax_tree_search
The latter handles connection issues and tries to reconnect. Method
syntax_tree_search appears to be called from quite a few place where it seems
useful to be resilient to connection issues (authentication for instance).
This reconnection logic appears to have disappeared at some point when working
on https://www.cubicweb.org/2919309. Could not find the exact reason though...
#! /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