Fix test accelerator override #152

Job	Run time
eessi_container_script (listrepos_default)	1m 47s
eessi_container_script (unionfs)	3m 13s
eessi_container_script (run)	3m 9s
eessi_container_script (help)	2m 29s
eessi_container_script (listrepos_custom)	1m 37s
eessi_container_script (shell)	3m 31s
eessi_container_script (resume)	3m 25s
eessi_container_script (container)	2m 53s
	22m 4s

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