[server] avoid race-condition in timer events With a granularity of one second, there's a good chance calling localtime twice will return the same value. We should consider the event ready immediately if that happens, not wait one second.

usr/lib/PY_VERSION/*-packages/cubicweb/web
usr/share/cubicweb/cubes/shared/data
usr/share/cubicweb/cubes/shared/wdoc