LU-13142 lod: cleanup layout checking

LU-13142 lod: cleanup layout checking

Cleanup layout checking in lod layer and lfs command-line utility,
for DoM components.

Lustre-change: https://review.whamcloud.com/37267
Lustre-commit: 4ce8a29d8bfc5b77893b642cdf2c33ceed960866

Reported-by: Clement Barthelemy <clement.barthelemy@nextino.eu>
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Ib8b184a31d26442ed10241dc12a0452e5243d0e8
Reviewed-on: https://review.whamcloud.com/37410
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>