Make DC options static
Make DC options static

Some datacenters don't allow calling GetConfigRequest,
this way it can both be reused and such calls omitted.

andr-04/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon,expectocode/Telethon