table: blockIter: No need to copy key/value slice anymore
table: blockIter: No need to copy key/value slice anymore

conseweb/goleveldb,rentongzhang/goleveldb,trigrass2/goleveldb,btcsuite/goleveldb,FactomProject/goleveldb,zzl0/goleveldb,syndtr/goleveldb,ngaut/goleveldb,chai2010/goleveldb,hustbill/goleveldb,no2key/goleveldb