Update site package behavior #1191

Job	Run time
eessi_container_script (listrepos_custom)	38s
eessi_container_script (no_cvmfs_mounts)	1m 31s
eessi_container_script (exec)	1m 26s
eessi_container_script (help)	30s
eessi_container_script (run)	1m 21s
eessi_container_script (resume)	1m 34s
eessi_container_script (listrepos_default)	29s
eessi_container_script (shell)	1m 45s
eessi_container_script (unionfs)	1m 16s
eessi_container_script (container)	1m 26s
	11m 56s

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