Support passing dpkg options

[deric]

Support passing dpkg::options, as mentioned in documentation.

The setting will be applied globally, there's no way to pass the option to unattended upgrades only :disappointed:

[smortex]

The setting will be applied globally, there's no way to pass the option to unattended upgrades only 😞

That looks like a good reason to do this in your apt profile and not in your unattended_upgrade profile. :disappointed:

[deric]

@smortex You're right, it might be confusing. There's an open issue for supporting independent configuration file.