incus-user: Use users directory under main storage #148

Job	Run time
Documentation tests	14m 29s
Client tests (1.20.x, ubuntu-latest)	51s
Code tests	9m 26s
Client tests (1.20.x, macos-latest)	1m 15s
System tests (1.20.x, cluster, dir)	14m 14s
Client tests (1.20.x, windows-latest)	3m 21s
System tests (1.20.x, cluster, btrfs)	13m 9s
System tests (1.20.x, cluster, lvm)	13m 59s
System tests (1.20.x, cluster, zfs)	17m 1s
System tests (1.20.x, cluster, ceph)	7m 46s
System tests (1.20.x, cluster, random)	14m 0s
System tests (1.20.x, standalone, dir)	24m 1s
System tests (1.20.x, standalone, btrfs)	23m 27s
System tests (1.20.x, standalone, lvm)	43m 51s
System tests (1.20.x, standalone, zfs)	42m 42s
System tests (1.20.x, standalone, ceph)	6m 46s
System tests (1.20.x, standalone, random)	23m 59s
System tests (stable, cluster, dir)	12m 55s
System tests (stable, standalone, dir)	22m 15s
System tests (tip, cluster, dir)	13m 7s
System tests (tip, standalone, dir)	27m 47s
	5h 50m 21s

Provide feedback