Unattended upgrades: Configure different reboot time for hypervisors vs. guests

[amotl]

Currently, the reboot time is configured to be 4 o'clock in the morning for all hosts.

autopilot/debian-enable-unattended-upgrades.sh

Lines 15 to 16 in 9a80360

	# # Configure reboot time. Default is `04:00`.
	# export UNATTENDED_REBOOT_TIME=22:00

autopilot/debian-enable-unattended-upgrades.sh

Lines 177 to 178 in 9a80360

	# If automatic reboot is enabled and needed, reboot at the specific time.
	Unattended-Upgrade::Automatic-Reboot-Time "${UNATTENDED_REBOOT_TIME:-04:00}";

It would be better to determine if the program is running on a hypervisor host vs. a guest machine and configure the reboot time differently. For example, I can imagine configuring the reboot time to 5 o'clock for hypervisor hosts instead.

[Tonkenfo]

Wouldn't it be better to reboot the hypervisor first. Then possible mandatory reboots from vm's are already done. Sure there are some Machines that only get paused while the hypervisor reboots but on some hypervisors they get restarted.