Fix tarball naming for CPU-only tarballs #312

Job	Run time
eessi_container_script (help)	2m 30s
eessi_container_script (listrepos_custom)	1m 59s
eessi_container_script (container)	3m 11s
eessi_container_script (run)	3m 36s
eessi_container_script (shell)	3m 21s
eessi_container_script (unionfs)	3m 9s
eessi_container_script (listrepos_default)	1m 55s
eessi_container_script (resume)	3m 13s
	22m 54s

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