FUSE: cache: put by-date/ entries in direntry cache
Since those entries are updated in the background, we invalidate the cache on a regular basis.
Close #2864 (closed). This should also fix the second problem of #2830 (closed), namely the fact that get_entries(by_date, offset) was not reliable because of the offset supposing the entries were the same every time.
Migrated from D4805 (view on Phabricator)