* Make CleanerChore less chatty: move WARN message to DEBUG when we expect non-empty dirs * Make CleanerChore less chatty: move IOE we'll retry to INFO * CleanerChore should treat IOE for FileStatus as a failure * Add tests asserting assumptions in above Signed-off-by: Reid Chan <reidddchan@outlook.com> Signed-off-by: Mike Drob <mdrob@apache.org>