LU-17434 lmv: add exclude list for remote dir

LU-17434 lmv: add exclude list for remote dir

Apache Spark creating a _temporary subdirectory for staging files, and
it should be created on the same MDT as its parent directory. Add a
tunable lmv.*.qos_exclude_prefixes, if directory prefix is in this
list, lmv_create() should put it on its parent MDT.

This prefix list follows the same rule of shell environment PATH: use
':' as separator for prefixes. And for convenience '+/-' can be used
to add/remove prefixes.

Add sanity 413k.

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: I4c8a118f0630c19054934a87bee3599bdb1fe7bb
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53780
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>