Allow building for a list of accelerators in a single build #1027

Job	Run time
eessi_container_script (listrepos_default)	1m 29s
eessi_container_script (exec)	2m 39s
eessi_container_script (resume)	2m 55s
eessi_container_script (no_cvmfs_mounts)	2m 34s
eessi_container_script (listrepos_custom)	2m 3s
eessi_container_script (shell)	2m 28s
eessi_container_script (unionfs)	2m 18s
eessi_container_script (run)	2m 21s
eessi_container_script (container)	2m 14s
eessi_container_script (help)	1m 22s
	22m 23s

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