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.

Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: Ie5f44212ab96bdc706cc5a9e11f330234fc01069
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51060
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>