runner/libvirt: fix udev-based interface renaming

The Cumulus QCOW2 images contain an init script that renames
network interfaces. This appears to mess with our injected
udev rules. Delete it and everything starts to work.

runner/libvirt/customize.go

@@ -34,6 +34,9 @@ func customizeDomain(ctx context.Context, uri string, d *device, extraCommands i
 		"-c", uri,
 		"--hostname", d.topoDev.Name,
 		"--timezone", "Etc/UTC",
+		// This rename script basically does s/eth/swp/ and breaks
+		// proper interface naming using udev rules. Delete it.
+		"--delete", "/etc/hw_init.d/S10rename_eth_swp.sh",
 		"--write", "/etc/udev/rules.d/70-persistent-net.rules:"+string(rules),
 		"--commands-from-file", "/dev/stdin",
 	)