add missing batch write guard for zadd
add missing batch write guard for zadd

spitfire2/ardb,wfxiang08/ardb,tempbottle/ardb,yinqiwen/ardb,yinqiwen/ardb,tempbottle/ardb,wfxiang08/ardb,cloudrain21/ardb,cloudrain21/ardb,lsm/ardb,lsm/ardb,spitfire2/ardb,bssrdf/ardb,placrosse/ardb,placrosse/ardb,bssrdf/ardb