shared/cliconfig: Fix main socket detection #157

Job	Run time
Code tests	11m 53s
Documentation tests	10m 20s
Client tests (1.20.x, ubuntu-latest)	48s
System tests (1.20.x, cluster, dir)	13m 5s
Client tests (1.20.x, macos-latest)	1m 2s
Client tests (1.20.x, windows-latest)	2m 33s
System tests (1.20.x, cluster, btrfs)	13m 19s
System tests (1.20.x, cluster, lvm)	14m 2s
System tests (1.20.x, cluster, zfs)	13m 51s
System tests (1.20.x, cluster, ceph)	7m 15s
System tests (1.20.x, cluster, random)	13m 47s
System tests (1.20.x, standalone, dir)	23m 4s
System tests (1.20.x, standalone, btrfs)	23m 28s
System tests (1.20.x, standalone, lvm)	23m 26s
System tests (1.20.x, standalone, zfs)	23m 27s
System tests (1.20.x, standalone, ceph)	23m 26s
System tests (1.20.x, standalone, random)	23m 27s
System tests (stable, cluster, dir)	11m 52s
System tests (stable, standalone, dir)	22m 25s
System tests (tip, cluster, dir)	13m 8s
System tests (tip, standalone, dir)	14m 3s
	5h 3m 41s

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