EX-3598 lamigo: dump lfs's stdout/stderr

EX-3598 lamigo: dump lfs's stdout/stderr

in case of error

Lustre-change: https://review.whamcloud.com/44505
Lustre-commit: f8d365d8d7eaa24715fe4f68687051a6addc94bd

Test-Parameters: trivial testlist=hot-pools
Change-Id: Iea0c6fc097255f02df3698c1e3a31b39bfa09ca1
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51711
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>