LU-17261 lov: ignore broken components

LU-17261 lov: ignore broken components

if some component of a mirrored file is broken, it makes sense
to try another (possible valid) replica rather than give up
immediately.

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I32ea0efa90109f5159bf8b6c4e0efe1d543580c3
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52996
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Zhenyu Xu <bobijam@hotmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>