remove known issues file (belongs in `EESSI/software-layer` repo) #4

Job	Run time
eessi_container_script (help)	1m 9s
eessi_container_script (listrepos_custom)	1m 13s
eessi_container_script (run)	2m 18s
eessi_container_script (listrepos_default)	1m 22s
eessi_container_script (container)	2m 17s
eessi_container_script (shell)	3m 20s
eessi_container_script (resume)	3m 46s
	15m 25s

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