Also set `REQUESTS_CA_BUNDLE`, `SSL_CERT_FILE` on RHEL-like systems #944

Job	Run time
eessi_container_script (shell)	3m 0s
eessi_container_script (exec)	2m 46s
eessi_container_script (help)	1m 53s
eessi_container_script (listrepos_custom)	2m 2s
eessi_container_script (run)	3m 13s
eessi_container_script (unionfs)	2m 50s
eessi_container_script (container)	2m 42s
eessi_container_script (no_cvmfs_mounts)	3m 32s
eessi_container_script (listrepos_default)	3m 4s
eessi_container_script (resume)	3m 28s
	28m 30s

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