This reverts commit 2a1ca3f6.

Reason for revert: to be replaced by recipe_engine runtime module
in https://chromium-review.googlesource.com/#/c/infra/luci/recipes-py/+/759677  

Original change's description:
> Add luci_migration recipe module.
> 
> R=​iannucci@chromium.org
> 
> Bug: 782460
> Change-Id: I022deb4d8e3cee8d48e1acccc78f8681490c72b9
> Reviewed-on: https://chromium-review.googlesource.com/757820
> Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
> Reviewed-by: Robbie Iannucci <iannucci@chromium.org>

TBR=iannucci@chromium.org,tandrii@chromium.org

Change-Id: Ieb874ad42b939edb66e35db3cfed0b8b8746e70e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 782460
Reviewed-on: https://chromium-review.googlesource.com/759357Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>