LU-5170 utils: Continue on error when multiple files requested

For lfs commands that accept multiple file arguments, processing
continues even if any of the files generates an error, instead
of immediately aborting. This follows the Unix convention of
attempting to process all requested files. Any relevant error
messages are reported as they are encountered.

Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Change-Id: I1bcfc18d17c76505796b8e367224d01f48731d9f
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/30663


Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>