shared/cliconfig: Improve error handling #823

Job	Run time
Code	6m 21s
Client (1.20.x, ubuntu-latest)	57s
Client (1.20.x, macos-latest)	1m 25s
Documentation	6m 27s
System (1.20.x, cluster, dir)	12m 50s
System (1.20.x, cluster, btrfs)	12m 38s
Client (1.20.x, windows-latest)	2m 53s
System (1.20.x, cluster, lvm)	12m 13s
System (1.20.x, cluster, zfs)	12m 44s
System (1.20.x, cluster, ceph)	15m 24s
System (1.20.x, cluster, random)	13m 9s
System (1.20.x, standalone, dir)	22m 23s
System (1.20.x, standalone, btrfs)	21m 42s
System (1.20.x, standalone, lvm)	39m 29s
System (1.20.x, standalone, zfs)	42m 50s
System (1.20.x, standalone, ceph)	1h 14m 19s
System (1.20.x, standalone, random)	23m 57s
System (stable, cluster, dir)	11m 30s
System (stable, standalone, dir)	22m 38s
System (tip, cluster, dir)	11m 8s
System (tip, standalone, dir)	22m 1s
	6h 28m 58s

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