LU-12037 mdt: add option for cross-MDT rename

LU-12037 mdt: add option for cross-MDT rename

Add option mdt.mdt_remote_rename, if it's not set (it's set by
default), do cross-MDT rename as cp, this is used for debug or
user want to move inode in rename.

Add sanity test_24z.

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: Ia0d122f1716f17078b375f770a193347a6e50708
Reviewed-on: https://review.whamcloud.com/34410
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>