LU-6825 ofd: statfs needs NOT check layout LFSCK status

LU-6825 ofd: statfs needs NOT check layout LFSCK status

The ofd_statfs() needs NOT to check whether the layout LFSCK is
rebuilding the LAST_ID file(s) on the OST or not, because:
1) Such checking will be done when the MDT wants to pre-allocate
   OST-objects via ofd_create_hdl().
2) The STATFS request may be from client, if ofd_statfs() returns
   -ENOSPC to the client under the case of layout LFSCK rebuilding
   the LAST_ID file(s), the client may be confused.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: Iae9eb8485f3b971fda3bcd299df28db7ad4d80a0
Reviewed-on: http://review.whamcloud.com/15349
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>