[web/request] don't play tricks with utc offset We need an UTC datetime from a time.time()-type value. It turns out datetime provides a method to do just that. Related to #2154655.

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