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This is a reland of f26b6b6d

generate_buildbot_json.py has been updated to look for
luci-milo-dev.cfg in the generated subdirectory.

Original change's description:
> Migrate luci-milo-dev.cfg to starlark.
>
> Bug: 1011908
> Change-Id: Ic7f4fc26d75811f04c9f988866bb479a40e0d0c3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869713
> Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
> Reviewed-by: Aaron Gable <agable@chromium.org>
> Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#708714}

Bug: 1011908
Change-Id: Idef08a086a4d764967a9a2e9b20a5dc5903d9111
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877138
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709099}