It will avoid empty attrs in LFSCK request (lfsck_namespace_req).
The patch also shows invalid mode for dt_mode_to_dft() for debug.

Other cleanup for lfsck_namespace_striped_dir_rescan().

Lustre-change: https://review.whamcloud.com/32245


Lustre-commit: f7c35409

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I2874160d9a0c9e3084d0d3d7f365940108c82018
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/32522


Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>