LU-4659 mdd: rename forgets updating target linkea

LU-4659 mdd: rename forgets updating target linkea

MDD forgets updating target LinkEA if target is not unlinked, and
this will cause LinkEA inconsistency.

Signed-off-by: Lai Siyao <lai.siyao@intel.com>
Change-Id: I92b9019b9517513d0cf3f92cf09e7a546cee6027
Reviewed-on: http://review.whamcloud.com/9366
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Li Wei <wei.g.li@intel.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Henri Doreau <henri.doreau@cea.fr>