EX-5258 lipe: add hidden option -show_counters

EX-5258 lipe: add hidden option -show_counters

This patch adds a hidden output policy option
to lipe_find3 that shows how many total inodes
were scanned and the number of inodes
that matched the filters.

Usage example:
lipe_find3 /dev/nvme1n1 -path dir-1/* -show-counters
Output:
scanned: 1460
matched: 200

Test-Parameters: trivial
Signed-off-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Change-Id: Ibcd22a94e01ea6322cd38fd414e6058314aac8ef
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52937
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>