LU-14719 lod: distributed transaction check space

LU-14719 lod: distributed transaction check space

Distributed transaction failure may cause file missing or disconnected
directories, to avoid failure on disk full, check remote MDT free
space before transaction start.

The block/inode watermarks in obd_statfs_info are used to check
whether MDT has enough free blocks/inodes.

Add sanity 230x.

Lustre-commit: 6aee406c84b6b8fddf08b560acfcdf7c13c97e63
Lustre-change: https://review.whamcloud.com/47039

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: I0922e9c8668e8b842d313576bd68b52fa5d434ac
Reviewed-by: Qian Yingjin <qian@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/47867
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>