[utils] Implements __iter__ on QueryCache In order to be able to iterate over the currently cached queries (so that they may be inspected and invalidated), this changeset implementes __iter__ on QueryCache.

version=3
opts=uversionmangle=s/(rc|a|b|c)/~$1/ \
https://pypi.debian.net/cubicweb/cubicweb-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))