In the QNetworkAccessManager machinery we would treat "no-cache" as if
it meant "don't cache" while in reality it means "don't return these
cached elements without making sure they're up-to-date"
At the same time as this change is made let's add test data for
"no-store", which replaces the "no-cache" test data.
Fixes: QTBUG-71896
Change-Id: Ieda98f3982884ccc839cac2420c777968c786f6e
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Mikhail Svetkin <mikhail.svetkin@qt.io>