LU-147 hash code cleanup

LU-147 hash code cleanup

Change-Id: I97cc182a9618271e59c4d6a8fbc2e887e1fb1a17
Signed-off-by: Alexey Lyashkov <Alexey_Lyashkov@xyratex.com>
Signed-off-by: Vitaly Fertman <vitaly_fertman@xyratex.com>
Reviewed-on: http://review.whamcloud.com/346
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Liang Zhen <liang@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>