LU-4788 lfsck: LFSCK code framework adjustment (1)

LU-4788 lfsck: LFSCK code framework adjustment (1)

The LFSCK wrap functions are only used by the LFSCK engines.
So move these functions from lfsck_lib.c to lfsck_engine.c.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: Ic192c71101c1718fe893b64f8e4ff74f4992914b
Reviewed-on: http://review.whamcloud.com/10493
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>