Remove luci *-dev configs for CrOS dut flasher cron.

Moving to prod in infra's buckets in:
https://chromium-review.googlesource.com/c/infra/infra/+/1380876

R=jbudorick, martiniss

Bug: 866062
Change-Id: I65922a1a220e07adccd37ff274e5e26634e3c53f
Reviewed-on: https://chromium-review.googlesource.com/c/1380678
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617264}
2 files changed