Allow automated detection of update failures

Demi Obenourrequested to merge
AlwaysCurious/apt:fail-on-update-error into master

This adds the option --fail-on-download-error to apt-get, along with a corresponding configuration option APT::Get::Fail-On-Download-Error. If this is set, download errors result in a non-zero exit code. This allows automated tools to check for indefinite freeze attacks.

Edited by Demi Obenour

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