Double check and make sure that unattended OS upgrades are disabled

[akarasulu]

Unattended upgrades especially on Ubuntu cause severe issues. Something is broken with it and it keeps on trying to do upgrades and consumes almost all of the peer's resources. It eventually corrects itself but is a problem. Let users turn upgrades on if they want or upgrade manually.

This can be done by using certain Debian Installer directives in the generated pre-seed files. So I'm talking about http/xenial.sh and http/stretch.sh. The DI directives might be different for xenial verses stretch since Ubuntu uses a different unattended-upgrade system (I think): just keep this in mind.

This is not urgent.