VM agent tweaks #1151

Job	Run time
Code	7m 15s
Client (1.21.x, ubuntu-latest)	17s
Documentation	6m 26s
Client (1.21.x, macos-latest)	33s
Client (1.21.x, windows-latest)	2m 3s
System (1.21.x, cluster, dir)	11m 29s
System (1.21.x, cluster, btrfs)	12m 40s
System (1.21.x, cluster, lvm)	12m 53s
System (1.21.x, cluster, zfs)	13m 11s
System (1.21.x, cluster, ceph)	15m 23s
System (1.21.x, cluster, random)	12m 17s
System (1.21.x, standalone, dir)	22m 51s
System (1.21.x, standalone, btrfs)	20m 45s
System (1.21.x, standalone, lvm)	39m 24s
System (1.21.x, standalone, zfs)	41m 44s
System (1.21.x, standalone, ceph)	1h 13m 2s
System (1.21.x, standalone, random)	22m 58s
System (stable, cluster, dir)	11m 21s
System (stable, standalone, dir)	20m 41s
System (tip, cluster, dir)	11m 36s
System (tip, standalone, dir)	22m 19s
	6h 21m 8s

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