LU-16524 nodemap: filter out unknown records

LU-16524 nodemap: filter out unknown records

Ignore records of type NODEMAP_CLUSTER_IDX or NODEMAP_GLOBAL_IDX if
their subtype is not known. It would come from an upgraded server on
which new nodemap properties/entries would be set, and then downgraded
back to an older version.

Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I7e349fde7fc927b23500abb51d4aed91f938f8d1
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50230
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>