Comment 0 for bug 2024900

If the daemon is started and the vmbus is not present it will just exit with an error: https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/mantic/tree/tools/hv/hv_kvp_daemon.c#n1424

Thus, it would make sense to add "ConditionPathExists=/dev/vmbus/hv_kvp" in linux-cloud-tools-common.hv-kvp-daemon.service to prevent systemd from starting the daemon if the device is not there.