message: fix meta version invalid when upgrade from 2.0-alpha/rc1
diff: @@ -41,10 +41,10 @@ MetaVersion MetaVersionMan::getVersionByHost(kvstore::KVStore* kv) {
  }
  if (iter->valid()) {
  auto v1KeySize = hostPrefix.size() + sizeof(int64_t);
  - return (iter->key().size() == v1KeySize) ? MetaVersion::V1 : MetaVersion::UNKNOWN;
  + return (iter->key().size() == v1KeySize) ? MetaVersion::V1 : MetaVersion::V2;
  }
  - // No hosts exists, but other data need to upgrade
  - return MetaVersion::V1;
  + // No hosts exists, regard as regard as version 2
  + return MetaVersion::V2;
  }
  // static
  