EX-9121 lipe: Trivial improvements for dirs report

EX-9121 lipe: Trivial improvements for dirs report

Minor changes that do not affect functionality.
Adds functionality to fill the table by directory size.
Changes the output for the rating table slightly, adding
nesting visualization, but without sorting.

Test-Parameters: trivial testlist=sanity-lipe-scan3,sanity-lipe-find3
Signed-off-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Change-Id: I74c8978a2e8e4806f7f600db0a573ee162d5cd94
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/55394
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexandre Ioffe <aioffe@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>