EX-9585 lipe: add lipe_find3 pool option

EX-9585 lipe: add lipe_find3 pool option

Add an option to print the OST pool for a file with the
"-printf" argument, both as long option %{pool} as well as
short option and "%Lp" that is compatible with "lfs find".
The long %{pools} option prints *all* pools in the layout.

Update the lipe-find3.1 man page and add test cases for both.

Test-Parameters: trivial testlist=sanity-lipe-find3,sanity-lipe-scan3
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Change-Id: I18d2d3cc161c8aa92eb27c33b06214b6f53ebbe5
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54785
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexandre Ioffe <aioffe@ddn.com>