EX-8282 lfs: migrate compressed file without stripe info

EX-8282 lfs: migrate compressed file without stripe info

lfs migrate file without specifying stripe info will get layout info
from the file as the target layout template, and
llapi_layout_get_by_xattr() tries to convert LOV_PATTERN_* values
to user scope LLAPI_LAYOUT_* values, while LOV_PATTERN_COMPRESS
is missed in this conversion.

This patch add a function llapi_pattern_from_lov() to handle this
conversion specifically.

This patch also add more error messages for llapi_layout_file_open().

Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I49a43cc7761cd2baed7a5da7d4e7cff2152ff9bb
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53039
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>