message: replace some interface in pika_hyperloglog
diff: @@ -26,9 +26,8 @@ void PfAddCmd::DoInitial(PikaCmdArgsType &argv, const CmdInfo* const ptr_info) {
  }
  void PfAddCmd::Do() {
  - nemo::Status s;
  bool update = false;
  - s = g_pika_server->db()->PfAdd(key_, values_, update);
  + rocksdb::Status s = g_pika_server->bdb()->PfAdd(key_, values_, &update);
  if (s.ok() && update) {
  res_.AppendInteger(1);
  } else if (s.ok() && !update) {
  @@ -50,9 +49,8 @@ void PfCountCmd::DoInitial(PikaCmdArgsType &argv, const CmdInfo* const ptr_info)
  }
  void PfCountCmd::Do() {
  - nemo::Status s;
  - int value_;
  - s = g_pika_server->db()->PfCount(keys_, value_);
  + int64_t value_ = 0;
  + rocksdb::Status s = g_pika_server->bdb()->PfCount(keys_, &value_);
  if (s.ok()) {
  res_.AppendInteger(value_);
  } else {
  @@ -72,8 +70,7 @@ void PfMergeCmd::DoInitial(PikaCmdArgsType &argv, const CmdInfo* const ptr_info)
  }
  void PfMergeCmd::Do() {
  - nemo::Status s;
  - s = g_pika_server->db()->PfMerge(keys_);
  + rocksdb::Status s = g_pika_server->bdb()->PfMerge(keys_);
  if (s.ok()) {
  res_.SetRes(CmdRes::kOk);
  } else {
  