db: close manifest reader when done; during session recovery
db: close manifest reader when done; during session recovery

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