hinted handoff: log message after removing hints directory (#5372)
hinted handoff: log message after removing hints directory (#5372)

To be used by dtest as an indicator that endpoint's hints
were drained and hints directory is removed.

Refs #5354

Signed-off-by: Benny Halevy <23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>
scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla