LU-14719 osp: add inode watermark
* move block watermark from debugfs to sysfs.
* add inode watermark for OSP.
Lustre-change: https://review.whamcloud.com/47128
Lustre-commit:
336eb696299e1c9731bd1443f05e5d814314ed36
Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: I7c768fa2ebfb4b8c2f75255f9e9c061d4c15cf66
Reviewed-on: https://review.whamcloud.com/47866
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>