- Ubuntu/Debian/SteamOS have an entry in /etc/hosts that maps hostname to 127.0.1.1
- This breaks the code that tries to advertise local addr over LAN (e.g. OnlineSubsystemNull).
- Resolves UE-5407 (ShooterGame cannot join match)
#codereview Josh.Adams, Michael.Trepka
[CL 2401553 by Dmitry Rekman in Main branch]