Remove Yandex-specific logic to identify the data center and rack of the server #125
Description
Currently YDB open source includes the logic to automatically identify the data center, rack and logical cluster name of the server, based on the specifics of the internal Yandex infrastructure.
This logic makes no sense for other users, and causes unneeded HTTP requests to Yandex API servers, so it should be removed.
The related code is currently at https://github.com/ydb-platform/ydb/blob/main/ydb/core/actorlib_impl/node_identifier.cpp#L67