mvcc/backend: remove db.tmp regardless of logger presence
mvcc/backend: remove db.tmp regardless of logger presence

ajityagaty/etcd,gyuho/etcd,ajityagaty/etcd,rnaveiras/etcd,etcd-io/etcd,mqliang/etcd,rnaveiras/etcd,mkumatag/etcd,li-ang/etcd,coreos/etcd,mkumatag/etcd,ajityagaty/etcd,rnaveiras/etcd,mkumatag/etcd,dannysauer/etcd,mqliang/etcd,li-ang/etcd,dannysauer/etcd,gyuho/etcd,mqliang/etcd,cockroachdb/etcd,etcd-io/etcd,cockroachdb/etcd,coreos/etcd,etcd-io/etcd