Add better acquire debugging support

Julian Andres Kloderequested to merge
jak/apt:pu/http-debug into master

This does two things:

  • Always include error messages from _error if there are any, even when Fail() has an error message being passed
  • Add an option Acquire::Failure::Abort() to cause Fail() to abort() instead

This should simplify debugging stuff like https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=968220

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