db: testDesc: introduce reads counter
db: testDesc: introduce reads counter

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