LU-6316 lfsck: skip dot name entry

LU-6316 lfsck: skip dot name entry

It is unnecessary for the namespace LFSCK to verify the dot
entry since it is always on the local MDT and has no linkEA.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I01289b04c8807e930c6f777007f1e1fb3295431d
Reviewed-on: http://review.whamcloud.com/13923
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>