LU-6420 lfsck: misc patch to avoid unexpected repairing

LU-6420 lfsck: misc patch to avoid unexpected repairing

It contains several fixes, including:

1) Generate D_LFSCK debug log only when the inconsistency needs
   to be repaired (or failed to be repaired).

2) If the OST-object's PFID EA has not been initialized, then
   not handle it as inconsistency.

3) Other fixes.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I3124ec6fa66c242b2cd8ebbf0fa99b2dc6f022a6
Reviewed-on: http://review.whamcloud.com/14332
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>