We don't seem to have a scarlet model, we only have a dru model in the scarlet board, but querying the lab it looks like we have a bunch of model:scarlet that should be invalid, and no model:dru.

bhthompson@ragnarok:/usr/local/ssd960gb/chromiumos-1/src/third_party/autotest/files/contrib$ atest host list -b model:dru | ./count_labels -p
bhthompson@ragnarok:/usr/local/ssd960gb/chromiumos-1/src/third_party/autotest/files/contrib$ atest host list -b model:scarlet | ./count_labels -p 
     10 bvt
      1 crosperf
      6 cts
      1 faft-cr50
      3 faft-test
      8 suites
      1 wificell
bhthompson@ragnarok:/usr/local/ssd960gb/chromiumos-1/src/third_party/autotest/files/contrib$

Should we relabel the model:scarlet systems to model:dru?

FWIW lab board name in https://cros-goldeneye.corp.google.com/chromeos/console/viewModel?name=dru may not be working, we should probably clear this when we get our model labels right.