When upgrading Debian packages, the system sometimes what to prompt the
user about what action to perform.  Since a tasks is supposed to be
non-interactive, we should disable such prompts.

This help when updating some packages, e.g. postfix.

Add support for optional apt::proxy::perhost array to configure bypass (DIRECT) or alternative proxy for specific repository hosts.

When updating configuration file, apt by default prompt the user for the
action to perform.  Since we are running in a non-interactive context,
skip these prompts:

  * `--force-confdef` ensure the configuration file is replaced by a
    newer version in the package if the previous package default
    configuration file was not modified;
  * `--force-confold` keep the configuration file as it is if it has
    been modified compared to the one shipped in the previous version of the
    package.

(maint) Set DEBIAN_FRONTEND=noninteractive on upgrade

(MODULES-11173) Add per-host overrides for apt::proxy

…_debian_8_support

pdksync - (IAC-1598) - Remove Support for Debian 8

Release prep v8.3.0