LU-16837 llite: handle unknown layout component

LU-16837 llite: handle unknown layout component

If lustre client encounters unknown layout component pattern in
a mirror file, this patch makes client mark this mirror as invalid
and skip it.

Lustre-change: https://review.whamcloud.com/51060
Lustre-commit: 14ed4a6f8f231fe94392906f991a32f07e7d7883

Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: Ie5f44212ab96bdc706cc5a9e11f330234fc01069
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51061
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>