LU-17703 lod: check the inherited pool for conflicts

LU-17703 lod: check the inherited pool for conflicts

In addition to LU-15658, the start index could be inherited from
parent and the pool from root: drop the pool in case of conflict
as well.

Another case of a problem inheritance is saving the inherited LOVEA
to subdir, when all the parameters are inherited but the ost list.

HPE-bug-id: LUS-11330, LUS-11631
Signed-off-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Change-Id: Ief1dbd8c1ee0433bb625cbff1834b248d4fb2992
Reviewed-on: https://es-gerrit.hpc.amslabs.hpecorp.net/161800
Tested-by: Alexander Lezhoev <alexander.lezhoev@hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Andriy Skulysh <c17819@cray.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54661
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Andriy Skulysh <andriy.skulysh@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>