CQBE-0: fix config_file is hardcode in run_job_linux.sh

Change-Id: I7b378954cba3798c02d62ab9bff8a3d5f5347bb3
Reviewed-on: http://review.couchbase.org/37263
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>