e2fsck: 3 level hash tree directory optimization

e2fsck fix for partitions with 3 level hash directries.
Additional level is added to e2fsck -D codepath.

Signed-off-by: Artem Blagodarenko <artem.blagodarenko@seagate.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
5 files changed