Add usecase for FPS Game Xonotic

[seokho-son]

Add script to deploy FPS Game Xonotic server to MC-Infra.

What is Xonotic.
https://xonotic.org/

How to use (example)

./create-all.sh -n shson2 -f ../testSet01.env
./deploy-fps-game.sh -n shson2 -f ../testSet01.env

shson@dev:~/go/src/github.com/cloud-barista/cb-tumblebug/src/testclient/scripts/sequentialFullTest$ ./deploy-fps-game.sh -n shson2 -f ../testSet01.env 
####################################################################
## Deploy-Xonotic-FPS-Game-to-mcis 
####################################################################

MASTERIP: 13.213.58.171

Installing Xonotic to MCIS...

...

[DATE: 22/12/2021 03:50:48] [ElapsedTime: 100s (1m:40s)] [Command: ./deploy-fps-game.sh all 1 shson2 ../testSet01.env]

[MCIS Xonotic: complete] Access to
 13.213.58.171:26000

To access the game server,

• download Xonotic game client : https://z.xnz.me/xonotic/builds/xonotic-0.8.2.zip

• execute xonotic.exe

• select Multiplayer Game

• input Address for the dedicated server with port number (ex: 13.213.58.171:26000)
  

• enjoy the game with your friends !!
  

[seokho-son]

/approve