Don't pre-install hplip

Nate Grahamrequested to merge
work/ngraham/remove-hplip into master

The content in here isn't necessary:

  • New HP driverless devices don't need it
  • Many older wired HP driver-needy printers can use ipp-usb
  • The rest of the older printers can generally use gutenprint
  • HP scanners can use standard software via SANE

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