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This is a reland of 3bcc71d8

Original change's description:
> Add luci-go tool to be fetched via CIPD
> 
> Do not remove the adhoc mechanism on GCS that predates CIPD yet, as the recipes
> need to be updated.
> 
> Change analyze to not ignore changes to isolate.
> 
> R=tandrii@chromium.org
> 
> Bug: 851596
> Change-Id: Ic068db83dea4c3a0f17b55181de523b16c9838a5
> Reviewed-on: https://chromium-review.googlesource.com/1097623
> Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
> Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#569688}

Bug: 851596
Change-Id: I27382d97370376dcca8110c9225c16dada182256
Reviewed-on: https://chromium-review.googlesource.com/1125000Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572435}