All tests against `lssd` types fail

[jonathanspw]

<failure message="" type="Failure"><![CDATA[step "stop-boot-1" run error: googleapi: Error 400: VM has a Local SSD attached but an undefined value for `discard-local-ssd`. If using gcloud, please add `--discard-local-ssd=false` or `--discard-local-ssd=true` to your command., badRequest]]></failure>