Update focal to 19.11.1

Christian Ehrhardtrequested to merge
update-focal-to-19.11.1 into update-unstable-to-19.11.1

As discussed this would be the delta we need for focal, reasons:

  • still having no libbpf (carry on old delta)
  • Ubuntu is in feature freeze so I can't add the new binary packages
  • I marked 19.11-4 and 19.11.1-1 Unreleased as so far that is what they are

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