759754 bin/prepare_test_env.sh: Add option to specify the gitlab/salt instance

Authored and Committed by Theo Chatzimichos 5 years ago
    bin/prepare_test_env.sh: Add option to specify the gitlab/salt instance
    
    This way there is no effort to sync the testsuites between the instances
    The installation of the packages has also been commented out, as they
    are now installed at the docker image. This speeds up the tests a lot
    
        
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