Remove now unused function directory_get
As of swh-web!48 (closed), directory_get has no users left; Time to remove it.
Test Plan
make test in the toplevel environment still works
Migrated from D339 (view on Phabricator)
As of swh-web!48 (closed), directory_get has no users left; Time to remove it.
make test in the toplevel environment still works
Migrated from D339 (view on Phabricator)