Make lxd-agent install script compatible with SUSE #11215

Job	Run time
Code	9m 45s
Code	9m 45s
Client (1.22.x, ubuntu-latest)	19s
Client (1.22.x, ubuntu-latest)	19s
Documentation	4m 9s
Documentation	4m 9s
System (1.22.x, cluster, dir)	18m 12s
System (1.22.x, cluster, dir)	18m 12s
Client (1.22.x, macos-latest)	24s
Client (1.22.x, macos-latest)	24s
Client (1.22.x, windows-latest)	2m 6s
Client (1.22.x, windows-latest)	2m 6s
System (1.22.x, cluster, btrfs)	13m 11s
System (1.22.x, cluster, btrfs)	13m 11s
System (1.22.x, cluster, lvm)	13m 15s
System (1.22.x, cluster, lvm)	13m 15s
System (1.22.x, cluster, zfs)	12m 47s
System (1.22.x, cluster, zfs)	12m 47s
System (1.22.x, cluster, ceph)	22m 46s
System (1.22.x, cluster, ceph)	22m 46s
System (1.22.x, cluster, random)	14m 5s
System (1.22.x, cluster, random)	14m 5s
System (1.22.x, standalone, dir)	25m 42s
System (1.22.x, standalone, dir)	25m 42s
System (1.22.x, standalone, btrfs)	25m 8s
System (1.22.x, standalone, btrfs)	25m 8s
System (1.22.x, standalone, lvm)	45m 10s
System (1.22.x, standalone, lvm)	45m 10s
System (1.22.x, standalone, zfs)	42m 13s
System (1.22.x, standalone, zfs)	42m 13s
System (1.22.x, standalone, ceph)	56m 35s
System (1.22.x, standalone, ceph)	56m 20s
System (1.22.x, standalone, random)	32m 18s
System (1.22.x, standalone, random)	32m 18s
System (stable, cluster, dir)	11m 27s
System (stable, cluster, dir)	11m 27s
System (stable, standalone, dir)	24m 48s
System (stable, standalone, dir)	24m 48s
Trigger snap edge build	0s
Trigger snap edge build	0s
	12h 28m 25s

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