message: fix a bug: using 2.0 decoder to decode 1.0 host addr val
diff: @@ -52,7 +52,7 @@ std::vector<HostAddr> ActiveHostsMan::getActiveHosts(kvstore::KVStore* kv,
  auto now = time::WallClock::fastNowInMilliSec();
  while (iter->valid()) {
  auto host = MetaServiceUtils::parseHostKey(iter->key());
  - HostInfo info = HostInfo::decodeV2(iter->val());
  + HostInfo info = HostInfo::decode(iter->val());
  if (info.role_ != role) {
  iter->next();
  continue;
  