Server is not kicking unauthorized clients out of the game about gamelift-example-ue4

[chris-gong]

After further review, it may not be smart do this in the InitNewPlayer function of my server's GameModeBase class.

[chris-gong]

Not sure which commit I implemented the solution to this issue in, but I just populated the ErrorMessage parameter in the PreLogin function of the server's AGameMode class if the call to GameLift's AcceptPlayerSession failed. The Login function, which is called right after PreLogin, checks the ErrorMessage paramater, so if the ErrorMessage contains anything, then the player will be kicked because its player controller will never be created, thereby kicking the unauthorized client out of the game.