LU-14119 osd: add mount option "resetoi"

LU-14119 osd: add mount option "resetoi"

OI files on zfs are special, and they can't be deleted by user space
tools like rm. Sometimes the OI files may contain stale OI mappings,
and they needed to be removed for namespace consistency. Add a mount
option 'resetoi' to recreate OI files on mount time, and it will
support both ldiskfs and zfs. This should be the standard way to
recreate OI files, other than mount as backend filesystem and unlink
them manually.

Add sanity-scrub 17.

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: Idc0e4c2f3b81675c49c6c005bc30b61d8fd04503