[rqlrewrite] Test and fix potential NameError We were referencing a loop variable, which may lead to a name error and show a potential error if there are several matching variables. To avoid this, introduce a list to hold every encountered variable and process all of them later.

etc/init.d
etc/cubicweb.d
etc/bash_completion.d
usr/bin
usr/share/doc/cubicweb-ctl
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances