Make cuda version check dynamic #952

Job	Run time
eessi_container_script (exec)	1m 38s
eessi_container_script (shell)	1m 47s
eessi_container_script (listrepos_custom)	1m 9s
eessi_container_script (container)	1m 35s
eessi_container_script (help)	43s
eessi_container_script (resume)	1m 51s
eessi_container_script (listrepos_default)	47s
eessi_container_script (unionfs)	2m 4s
eessi_container_script (run)	1m 40s
eessi_container_script (no_cvmfs_mounts)	1m 41s
	14m 55s

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