LU-16837 lustre: avoid the same member name

LU-16837 lustre: avoid the same member name

There are several structures using the same member name, such as
cl_ladvise_io::li_flags, layout_intent::li_flags and
lfsck_instance::li_flags, and this makes it hard to find where it
is used.

This patch renames some structures member prefix to avoid the
homonyms.

Test-Parameters: trivial
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: Ie592afa06dd0abf0c1110843e5d8007a91c68145
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51766
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>