Fix test-loading script
Fix test-loading script

Because of the path to the pod file, this script
could not be run with the command provided in
the doc file. This makes sure that the script
can be run, whatever the $PWD of the user.

Also, the script was referencing an inexistant
YAML file for the pod.

Change-Id: Iddd9af3a17c41a9880d913591cbb8a16793e2be9

GoogleCloudPlatform/gke-dedicated-game-server