EX-7290 lipe: lipe_find3 get attr warnings

EX-7290 lipe: lipe_find3 get attr warnings

Report each get attr error when command line
option --warnings=get-attr.
Count all get attr errors per attr type and report them at the end.
Exclude the 'trusted.link' when scanning an OST.

Test-Parameters: trivial testlist=sanity-lipe-scan3,sanity-lipe-find3,sanityn
Signed-off-by: Alexandre Ioffe <aioffe@ddn.com>
Change-Id: I5e9b226bd4046eddcf779ca06af0892589d447ac
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52292
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>